{"id":15613,"date":"2023-08-08T04:01:18","date_gmt":"2023-08-07T20:01:18","guid":{"rendered":"https:\/\/www.linuxcool.com\/ssdjsbchj"},"modified":"2023-08-08T04:01:18","modified_gmt":"2023-08-07T20:01:18","slug":"ssdjsbchj","status":"publish","type":"post","link":"https:\/\/www.linuxcool.com\/ssdjsbchj","title":{"rendered":"Shell\u4e0a\u642d\u5efaShell\u7f16\u7a0b\u73af\u5883"},"content":{"rendered":"

\u54ea\u4e9b\u662fShell<\/p>\n

\u5728Linux<\/a>\u7cfb\u7edf<\/a>\u4e2d\uff0cShell\u662f\u7528\u6237\u4e0e\u7cfb\u7edf\u5185\u6838\u4e4b\u95f4\u8fdb\u884c\u4ea4\u4e92\u7684\u63d2\u53e3\u3002<\/p>\n

Shell\u8fd9\u4e2a\u8bcd\u7ec4\u7684\u610f\u601d\u662f\u201c\u5916\u58f3\u201d\uff0c\u5b83\u5f62\u8c61\u5730\u6292\u53d1\u51fa\u4e86Shell\u7684\u4f5c\u7528\u3002\u5728UNIX\u4ee5\u53caLinux\u4e2d\uff0cShell\u5c31\u662f\u5957\u5728\u5185\u6838\u5916\u8fb9\u7684\u4e00\u5c42\u58f3\u4f53\u3002\u6b63\u7531\u4e8e\u6709Shell\u7684\u5b58\u5728\uff0c\u624d\u5411\u666e\u901a\u7684\u7528\u6237\u9690\u85cf\u4e86\u8bb8\u591a\u5173\u4e8e\u7cfb\u7edf\u5185\u6838\u7684\u7ec6\u8282\u3002<\/p>\n

Shell\u53c8\u79f0\u547d\u4ee4<\/a>\u4f8b\u7a0b\uff0c\u5b83\u80fd\u8fa8\u8bc6\u7528\u6237\u8f93\u5165\u7684\u5404\u7c7b\u547d\u4ee4\uff0c\u5e76\u4f20\u9012\u7ed9\u64cd\u4f5c\u7cfb\u7edf\u3002\u5b83\u7684\u4f5c\u7528\u7c7b\u4f3c\u4e8eWindows\u64cd\u4f5c\u7cfb\u7edf\u4e2d\u7684\u547d\u4ee4\u884c\uff0c\u7136\u800c\uff0cShell\u7684\u529f\u80fd\u8fdc\u6bd4\u547d\u4ee4\u884c\u5f3a\u608d\u5f97\u591a\u3002\u5728UNIX\u6216\u5219Linux\u4e2d\uff0cShell\u65e2\u662f\u7528\u6237\u4ea4\u4e92\u7684\u754c\u9762\uff0c\u4e5f\u662f\u63a7\u5236\u7cfb\u7edf\u7684\u811a\u672c\u8bed\u8a00\u3002<\/p>\n

Shell\u7684\u5206\u7c7b<\/p>\n

\u5173\u4e8eShell\u7684\u5206\u7c7b\uff0c\u5728\u4ecb\u7ecdShell\u7684\u5386\u53f2\u7684\u65f6\u4faf\u65e9\u5df2\u7b80\u5355\u5730\u4ecb\u7ecd\u8fc7\u4e00\u4e9b\u4e86\uff0c\u4e0b\u8fb9\u5bf9\u5404\u7c7bShell\u7a0b\u5e8f\u505a\u4e00\u4e2a\u7b80\u5355\u7684\u6982\u62ec\u3002\u5e38\u89c1\u7684\u51e0\u79cdShell\u7a0b\u5e8f\u5982\u4e0b\u6240\u8ff0\u3002<\/p>\n

\u5bf9\u4e8e\u8fd9\u79cdShell\u7a0b\u5e8f\uff0c\u5176\u53e5\u578b\u6216\u591a\u6216\u5c11\u90fd\u6709\u6240\u533a\u522b\u3002\u76ee\u524d\u5927\u90e8\u4efd\u4eba\u4e00\u76f4\u5efa\u8bae\u4f7f\u7528\u6807\u51c6\u7684BourneAgainShell\u3002<\/p>\n

Shell\u4e0d\u4ec5\u4ec5\u662f\u5145\u5f53\u7528\u6237\u4e0eUNIX\u6216\u5219Linux\u4ea4\u4e92\u754c\u9762\u7684\u89d2\u8272\uff0c\u8fd8\u53ef\u4ee5\u4f5c\u4e3a\u4e00\u79cd\u7a0b\u5e8f\u8bbe\u8ba1\u8bed\u8a00\u6765\u4f7f\u7528\u3002\u901a\u8fc7Shell\u7f16\u7a0b\uff0c\u53ef\u4ee5\u5b9e\u73b0\u8bb8\u591a\u5341\u5206\u5b9e\u7528\u7684\u529f\u80fd\uff0c\u589e\u5f3a\u7cfb\u7edf\u7ba1\u7406\u7684\u624b\u52a8\u5316\u6c34\u5e73\u3002<\/p>\n

\u5728linux\u4e0a\u642d\u5efaShell\u7f16\u7a0b\u73af\u5883<\/p>\n

\u56e0\u4e3aLinux\u672c\u8eab\u5c31\u4f1a\u9ed8\u8ba4\u5b89\u88c5Shell\u811a\u672c\u7684\u8fd0\u884c\u73af\u5883\uff0c\u6240\u4ee5\u4e00\u822c\u60c5\u51b5\u4e0b\uff0c\u5e76\u4e0d\u987b\u8981\u7528\u6237\u989d\u5916\u5b89\u88c5\u54ea\u4e9b\u8f6f\u4ef6\u3002<\/p>\n

\u5728\u540c\u4e00\u53f0Linux\u91cc\u9762\u4f1a\u540c\u65f6\u5b89\u88c5\u591a\u4e2aShell\uff0c\u800c\u4e14\uff0c\u8fd9\u79cdShell\u7684\u53e5\u578b\u4f1a\u6709\u6240\u4e0d\u540c\uff0c\u6240\u4ee5\uff0c\u7528\u6237\u5728\u7f16\u64b0\u548c\u6267\u884cShell\u811a\u672c\u7684\u65f6\u4faf\u4e00\u5b9a\u8981\u5f04\u6e05\u695a\u5f53\u524d\u4f7f\u7528\u7684\u662f\u54ea\u79cdShell\u3002\u7528\u6237\u53ef\u4ee5\u4f7f\u7528\u7cfb\u7edf\u53d8\u91cf$SHELL\u6765\u83b7\u53d6\u5f53\u524d\u7cfb\u7edf\u9ed8\u8ba4\u7684Shell\u3002<\/p>\n

\n

echo $SHELL<\/code><\/pre>\n<\/p>\n
\u4ece\u524d\u9762\u7684\u8f93\u51fa\u7ed3\u679c\u53ef\u4ee5\u83b7\u77e5\uff0c\u5f53\u524d\u7cfb\u7edf\u9ed8\u8ba4\u7684Shell\u4e3abash\u3002<\/p>\n
\u6211\u4eec\u90fd\u662f\u6307\u5b9a\u4f7f\u7528\u7684Shell\u4e3a\/bin\/sh\u3002\u5b9e\u9645\u4e0a\uff0c\u5728Linux\u4e2d\uff0c\u8fd9\u662f\u4e00\u4e2a\u6307\u5411\/bin\/bash\u7684\u7b26\u53f7\u94fe\u63a5\uff0c\u5982\u4e0b\uff1a<\/p>\n
\u547d\u4ee4\u89e3\u91ca\u5668\u6709\u54ea\u4e9b_\u547d\u4ee4\u89e3\u91ca\u5668\u6709\u54ea\u4e24\u79cd_linux\u547d\u4ee4\u89e3\u91ca\u5668\u6709\u54ea\u4e9b<\/p>\n
\u8fd9\u610f\u5473\u7740\uff0c\u867d\u7136\u6211\u4eec\u5728\u7a0b\u5e8f\u624b\u6307\u5b9a\u7684\u7c7b\u5e93\u4e3a\/bin\/sh\uff0c\u7136\u800c\u5b9e\u9645\u4e0a\u89e3\u91caShell\u811a\u672c\u7684\u662f\/bin\/bash\u3002<\/p>\n
Shell\u4f5c\u4e3a\u4e00\u4e2a\u8f6f\u4ef6\u5305\uff0c\u5176\u5b9e\u4e5f\u6709\u7248\u672c\uff0c\u7528\u6237\u53ef\u4ee5\u4f7f\u7528\u5982\u4e0b\u547d\u4ee4\u6765\u67e5\u770bbash\u7684\u7248\u672c\uff1a<\/p>\n
\n
echo $BASH_VERSION<\/code><\/pre>\n<\/p>\n
Shell\u600e\u6837\u6267\u884c<\/p>\n
Shell\u811a\u672c\u7a0b\u5e8f\u6709\u4ee5\u4e0b\u4e24\u79cd\u6267\u884c\u65b9\u6cd5\uff1a<\/p>\n
\uff081\uff09\u7528\u6237\u53ef\u4ee5\u4f9d\u6b21\u8f93\u5165\u4e00\u7cfb\u5217\u7684\u547d\u4ee4\uff0c\u4ea4\u4e92\u5f0f\u5730\u6267\u884c\u5b83\u4eec\uff1b<\/p>\n
\uff082\uff09\u7528\u6237\u4e5f\u53ef\u4ee5\u628a\u6240\u6709\u7684\u8fd9\u79cd\u547d\u4ee4\u4f9d\u7167\u6b21\u5e8f\u4fdd\u5b58\u5728\u4e00\u4e2a\u6587\u4ef6\u4e2d\uff0c\u4e4b\u540e\u5c06\u8be5\u6587\u4ef6\u4f5c\u4e3a\u4e00\u4e2a\u7a0b\u5e8f\u6765\u6267\u884c\u3002<\/p>\n
\u4ea4\u4e92\u5f0f\u7a0b\u5e8f<\/p>\n
\u5728\u547d\u4ee4\u884c\u4e0a\u76f4\u63a5\u8f93\u5165\u547d\u4ee4\u6765\u4ea4\u4e92\u5f0f\u5730\u6267\u884cShell\u811a\u672c\u662f\u4e00\u79cd\u7279\u522b\u7b80\u5355\u7684\u5f62\u5f0f\u3002\u5c24\u5176\u662f\u5728\u6d4b\u8bd5Shell\u7a0b\u5e8f\u7684\u65f6\u4faf\uff0c\u901a\u8fc7\u4f7f\u7528\u4ea4\u4e92\u5f0f\u65b9\u6cd5\uff0c\u53ef\u4ee5\u5341\u5206\u4fbf\u6377\u5730\u5f97\u5230\u7a0b\u5e8f\u6267\u884c\u7684\u7ed3\u679c\u3002<\/p>\n
\u4f8b\uff1a\u5728\u5f53\u524d\u76ee\u5f55\u4e2d\u67e5\u627e\u6587\u4ef6\u540d\u5305\u542b\u201cxml\u201d\u8fd93\u4e2a\u5b57\u7b26\u7684\u6587\u4ef6\u3002\u5047\u5982\u627e\u5230\u7684\u8bdd\uff0c\u5219\u5728\u5f53\u524d\u5c4f\u5e55\u4e0a\u590d\u5370\u4e0b\u6765\u3002\u6211\u4eec\u53ef\u4ee5\u5728Shell\u63d0\u793a\u7b26\u524d\u9762\u4f9d\u6b21\u8f93\u5165\u4e0b\u8fb9\u7684\u4ee3\u7801\uff1a<\/p>\n
\n
[root@linux~]# for filename in `ls .`\n> do\n> if echo \"$filename\" | grep \"xml\"\n> then \n> echo \"$filename\"\n> fi\n> done\npackage.xml\npackage.xml\nwbxml1.0.3\nwbxml1.0.3\nwbxml1.0.3.tgz\nwbxml1.0.3.tgz<\/code><\/pre>\n<\/p>\n
\u547d\u4ee4\u884c\u76f4\u63a5\u6267\u884c\u529f\u80fd\u76f8\u540c\uff1a<\/p>\n
forfilenamein`ls.`;doifecho\u201c$filename\u201d|grep\u201cxml\u201d;thenecho\u201c$filename\u201d;fi;done<\/p>\n
\u521b\u5efa\u811a\u672c<\/p>\n
\u5bf9\u4e8e\u4e00\u7ec4\u987b\u8981\u65f6\u5e38\u91cd\u590d\u6267\u884c\u7684Shell\u53e5\u5b50\u6765\u8bf4\uff0c\u5c06\u5b83\u4eec\u4fdd\u5b58\u5728\u4e00\u4e2a\u6587\u4ef6\u4e2d\u6765\u6267\u884c\u662f\u4e00\u79cd\u5341\u5206\u660e\u667a\u7684\u505a\u6cd5\u3002\u6211\u4eec\u4e00\u822c\u79f0\u8fd9\u4e9b\u5305\u542b\u591a\u4e2aShell\u53e5\u5b50\u7684\u6587\u4ef6\u4e3aShell\u811a\u672c\uff0c\u6216\u5219Shell\u811a\u672c\u6587\u4ef6\u3002\u811a\u672c\u6587\u4ef6\u90fd\u662f\u666e\u901a\u7684\u6587\u672c\u6587\u4ef6\uff0c\u53ef\u4ee5\u4f7f\u7528\u4efb\u4f55\u7684\u6587\u672c\u7f16\u8f91\u5668\u67e5\u770b\u6216\u5219\u66f4\u6539Shell\u811a\u672c\u6587\u4ef6\u3002<\/p>\n
\n
#! \/bin\/sh\n# for \u5faa\u73af\u5f00\u59cb\nfor  filename  in  `ls .`\ndo\n    #\u5982\u679c\u6587\u4ef6\u540d\u5305\u542bxml\n    if  echo  \"$filename\" | grep \"xml\"; then\n        #\u8f93\u51fa\u6587\u4ef6\u540d\n        echo  \"$filename\"\n    fi\ndone<\/code><\/pre>\n<\/p>\n
\u4ece\u91cc\u9762\u7684\u4ee3\u7801\u53ef\u4ee5\u83b7\u77e5\uff0cShell\u7a0b\u5e8f\u4e2d\u7684\u6ce8\u91ca\u4ee5\u201c#\u201d\u7b26\u53f7\u5f00\u59cb\uff0c\u4ecd\u7136\u6301\u7eed\u5230\u8be5\u884c\u7684\u7ed3\u675f\u3002\u8bf7\u6ce8\u610f\u7b2c\u4e00\u884c#!\/bin\/sh\uff0c\u5b83\u662f\u4e00\u79cd\u7279\u6b8a\u65b9\u5f0f\u7684\u6ce8\u91ca\uff0c\u5176\u4e2d\uff0c\u201c#!\u201d\u5b57\u7b26\u544a\u8bc9\u7cfb\u7edf\u540c\u4e00\u884c\u4e2d\u7d27\u968f\u5728\u5b83\u524d\u9762\u7684\u90a3\u79cd\u53c2\u6570\u662f\u62ff\u6765\u6267\u884c\u672c\u6587\u4ef6\u7684\u7a0b\u5e8f\u3002\u5728\u8fd9\u4e2a\u4e8b\u4f8b\u4e2d\uff0c\/bin\/sh\u662f\u9ed8\u8ba4\u7684Shell\u7a0b\u5e8f\u3002\u5f53\u5c06\u811a\u672c\u7f16\u8f91\u5b8c\u6210\u4ee5\u540e\uff0c\u8fd9\u4e2a\u811a\u672c\u8fd8\u4e0d\u80fd\u9a6c\u4e0a\u6267\u884c\uff0c\u628a\u811a\u672c\u8bbe\u7f6e\u4e3a\u53ef\u6267\u884c\u3002<\/p>\n
Shell\u811a\u672c\u7684\u53c2\u6570<\/p>\n
\u4ece\u547d\u4ee4\u884c\u4f20\u9012\u7ed9Shell\u811a\u672c\u7684\u53c2\u6570\u53c8\u79f0\u4e3a\u4f4d\u7f6e\u53c2\u6570\uff0c\u8fd9\u4e3b\u8981\u662f\u7531\u4e8eShell\u811a\u672c\u4f1a\u4f9d\u7167\u53c2\u6570\u7684\u4f4d\u7f6e\u6765\u63a5\u6536\u5b83\u4eec\u7684\u503c\u3002\u5728Shell\u811a\u672c\u5185\u90e8\uff0c\u7528\u6237\u53ef\u4ee5\u901a\u8fc7\u4e00\u7cfb\u5217\u7684\u7cfb\u7edf\u53d8\u91cf\u6765\u83b7\u53d6\u53c2\u6570\u3002\u8fd9\u79cd\u53d8\u91cf\u7684\u540d\u79f0\u90fd\u662f\u56fa\u5b9a\u7684\uff0c\u800c\u4e14\u5341\u5206\u7b80\u5355\uff0c\u53ea\u75281\u4e2a\u5b57\u7b26\u8868\u793a\uff0c\u6bd4\u5982$0\u8868\u793a\u5f53\u524d\u6267\u884c\u7684\u811a\u672c\u540d\u79f0\uff0c$1\u8868\u793a\u4f20\u9012\u7ed9\u811a\u672c\u7684\u7b2c1\u4e2a\u53c2\u6570\u7b49\u3002<\/p>\n
\u547d\u4ee4\u89e3\u91ca\u5668\u6709\u54ea\u4e9b_\u547d\u4ee4\u89e3\u91ca\u5668\u6709\u54ea\u4e24\u79cd_linux\u547d\u4ee4\u89e3\u91ca\u5668\u6709\u54ea\u4e9b<\/p>\n
\u6ce8\uff1a<\/p>\n
\u7531\u5355\u5192\u53f7\u6216\u5219\u53cc\u5192\u53f7\u9020\u6210\u6765\u7684\u5b57\u7b26\u4e32\u4f5c\u4e3a\u4e00\u4e2a\u53c2\u6570\u8fdb\u884c\u4f20\u9012\uff0c\u4f20\u9012\u65f6\u4f1a\u53bb\u9664\u5192\u53f7\u3002<\/p>\n
\u5bf9\u4e8e\u5305\u542b\u7a7a\u767d\u5b57\u7b26\u6216\u5219\u5176\u4ed6\u7684\u7279\u6b8a\u5b57\u7b26\u7684\u53c2\u6570\uff0c\u987b\u8981\u4f7f\u7528\u5355\u5192\u53f7\u6216\u5219\u53cc\u5192\u53f7\u8fdb\u884c\u4f20\u9012\u3002<\/p>\n
\u53d8\u91cf$@\u53ef\u4ee5\u4ee5\u201c\u53c2\u65701\u201d\u201c\u53c2\u65702\u201d\u201c\u53c2\u65703\u201d\u2026\u2026\u7684\u65b9\u5f0f\u8fd4\u56de\u6240\u6709\u7684\u53c2\u6570\u7684\u503c\uff0c\u56e0\u800c\uff0c$@\u4e0e\u201c$1\u201d\u201c$2\u201d\u201c$3\u201d\u2026\u2026\u662f\u7b49\u4ef7\u7684\u3002\u5047\u5982\u7528\u6237\u4f20\u9012\u7684\u53c2\u6570\u4e2d\u5305\u542b\u7a7a\u683c\u6216\u5219\u5176\u4ed6\u7684\u7279\u6b8a\u5b57\u7b26\uff0c\u987b\u8981\u4f7f\u7528$@\u6765\u83b7\u53d6\u6240\u6709\u7684\u53c2\u6570\u7684\u503c\uff0c\u4e0d\u80fd\u4f7f\u7528$*\u3002<\/p>\n
\u53d8\u91cf$*\u4ee5\u201c\u53c2\u65701\u53c2\u65702\u53c2\u65703\u2026\u2026\u201d\u7684\u65b9\u5f0f\u5c06\u6240\u6709\u7684\u53c2\u6570\u4f5c\u4e3a\u4e00\u4e2a\u5b57\u7b26\u4e32\u8fd4\u56de\u3002\u4e00\u822c\u60c5\u51b5\u4e0b\uff0c\u53c2\u6570\u503c\u4e4b\u95f4\u901a\u8fc7\u7a7a\u683c\u3001\u5236\u8868\u7b26\u6216\u5219\u6362\u884c\u7b26\u6765\u9694\u5f00\uff0c\u5728\u9ed8\u8ba4\u60c5\u51b5\u4e0b\u4f7f\u7528\u7a7a\u683c\u3002<\/p>\n
\u53d8\u91cf$#\u8fd4\u56de\u4f20\u9012\u7ed9\u811a\u672c\u7684\u53c2\u6570\u7684\u6570\u76ee\uff0c\u4e0d\u5305\u62ec$0\uff0c\u5373\u6392\u9664\u811a\u672c\u7684\u540d\u79f0\u3002<\/p>\n
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Shell\u811a\u672c\u7684\u57fa\u672c\u5143\u7d20<\/p>\n
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Shell\u811a\u672c\u4e2d\u7684\u6ce8\u91ca\u548c\u98ce\u683c<\/p>\n
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\n
:<<BLOCK\n....\u6ce8\u91ca\u5185\u5bb9\nBLOCK<\/code><\/pre>\n<\/p>\n
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Shell\u7a0b\u5e8f\u7684\u9000\u51fa\u72b6\u6001<\/p>\n
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\u53d8\u91cf\u7684\u7c7b\u578b<\/p>\n
\u6309\u7167\u53d8\u91cf\u7c7b\u578b\u786e\u5b9a\u7684\u65f6\u95f4\uff0c\u53ef\u4ee5\u5c06\u7a0b\u5e8f\u8bbe\u8ba1\u8bed\u8a00\u5206\u4e3a\u4e24\u7c7b\uff0c\u5206\u522b\u662f\u9759\u6001\u7c7b\u578b\u8bed\u8a00\u548c\u52a8\u6001\u7c7b\u578b\u8bed\u8a00\u3002\u5176\u4e2d\uff0c\u9759\u6001\u7c7b\u578b\u8bed\u8a00\u662f\u5728\u7a0b\u5e8f\u7684\u7f16\u8bd1\u671f\u95f4\u5c31\u786e\u5b9a\u53d8\u91cf\u7c7b\u578b\u7684\u8bed\u8a00\uff0c\u6bd4\u5982Java\u3001C++\u548cPASCAL\uff0c\u5728\u8fd9\u79cd\u8bed\u8a00\u4e2d\u4f7f\u7528\u53d8\u91cf\u65f6\uff0c\u5fc5\u987b\u9996\u5148\u7533\u660e\u5176\u7c7b\u578b\u3002\u52a8\u6001\u8bbe\u8ba1\u8bed\u8a00\u662f\u5728\u7a0b\u5e8f\u6267\u884c\u8fc7\u7a0b\u4e2d\u624d\u786e\u5b9a\u53d8\u91cf\u7684\u6570\u636e\u7c7b\u578b\u7684\u8bed\u8a00\u3002\u5e38\u89c1\u7684\u52a8\u6001\u8bed\u8a00\u6709VBScript\u3001PHP\u53caPython\u7b49\u3002\u5728\u8fd9\u79cd\u8bed\u8a00\u4e2d\uff0c\u53d8\u91cf\u7684\u6570\u636e\u7c7b\u578b\u6309\u7167\u7b2c\u4e00\u6b21\u8d4b\u7ed9\u8be5\u53d8\u91cf\u7684\u503c\u7684\u6570\u636e\u7c7b\u578b\u6765\u786e\u5b9a\u3002<\/p>\n
\u540c\u6837\uff0c\u4f9d\u636e\u662f\u5426\u5f3a\u5236\u8981\u6c42\u7c7b\u578b\u5b9a\u4e49\uff0c\u53ef\u4ee5\u5c06\u7a0b\u5e8f\u8bbe\u8ba1\u8bed\u8a00\u5206\u4e3a\u5f3a\u7c7b\u578b\u8bed\u8a00\u548c\u5f31\u7c7b\u578b\u8bed\u8a00\u3002\u5f3a\u7c7b\u578b\u8bed\u8a00\u8981\u6c42\u7528\u6237\u5728\u5b9a\u4e49\u53d8\u91cf\u65f6\u5fc5\u987b\u660e\u6670\u6307\u5b9a\u5176\u6570\u636e\u7c7b\u578b\uff0c\u6bd4\u5982Java\u548cC++\u3002\u5728\u5f3a\u7c7b\u578b\u8bed\u8a00\u4e2d\uff0c\u6570\u636e\u7c7b\u578b\u4e4b\u95f4\u7684\u8f6c\u6362\u7279\u522b\u91cd\u8981\u3002\u4e0e\u4e4b\u76f8\u53cd\uff0c\u5f31\u7c7b\u578b\u8bed\u8a00\u5219\u4e0d\u8981\u6c42\u7528\u6237\u660e\u6670\u6307\u5b9a\u53d8\u91cf\u7684\u6570\u636e\u7c7b\u578b\uff0c\u6bd4\u5982VBScript\u3002\u7528\u6237\u53ef\u4ee5\u5c06\u4efb\u610f\u7c7b\u578b\u7684\u6570\u503c\u8d4b\u7ed9\u8be5\u53d8\u91cf\u3002\u800c\u4e14\uff0c\u53d8\u91cf\u7684\u6570\u636e\u7c7b\u578b\u4e4b\u95f4\u7684\u8f6c\u6362\u4e5f\u65e0\u9700\u660e\u6670\u8fdb\u884c\u3002<\/p>\n
Shell\u662f\u4e00\u79cd\u52a8\u6001\u7c7b\u578b\u8bed\u8a00\u548c\u5f31\u7c7b\u578b\u8bed\u8a00\uff0c\u5373\u5728Shell\u4e2d\uff0c\u53d8\u91cf\u7684\u6570\u636e\u7c7b\u578b\u65e0\u9700\u663e\u793a\u5730\u7533\u660e\uff0c\u53d8\u91cf\u7684\u6570\u636e\u7c7b\u578b\u4f1a\u4f9d\u7167\u4e0d\u540c\u7684\u64cd\u4f5c\u6709\u6240\u53d8\u5316\u3002\u786e\u5207\u5730\u8bb2\uff0cShell\u4e2d\u7684\u53d8\u91cf\u662f\u4e0d\u5206\u6570\u636e\u7c7b\u578b\u7684\uff0c\u7edf\u4e00\u5730\u6839\u636e\u5b57\u7b26\u4e32\u50a8\u5b58\u3002<\/p>\n
\u5728Shell\u4e2d\uff0c\u4e00\u822c\u60c5\u51b5\u4e0b\u7528\u6237\u53ef\u4ee5\u76f4\u63a5\u4f7f\u7528\u53d8\u91cf\uff0c\u65e0\u9700\u5148\u8fdb\u884c\u5b9a\u4e49\uff0c\u5f53\u7528\u6237\u7b2c\u4e00\u6b21\u4f7f\u7528\u67d0\u4e2a\u53d8\u91cf\u540d\u65f6\uff0c\u5b9e\u9645\u4e0a\u5c31\u540c\u65f6\u5b9a\u4e49\u4e86\u8fd9\u4e2a\u53d8\u91cf\uff0c\u5728\u53d8\u91cf\u7684\u4f5c\u7528\u57df\u5185\uff0c\u7528\u6237\u90fd\u53ef\u4ee5\u4f7f\u7528\u8be5\u53d8\u91cf\u3002<\/p>\n
\u867d\u7136\u901a\u8fc7\u4ee5\u4e0a\u65b9\u6cd5\u53ef\u4ee5\u5341\u5206\u4fbf\u6377\u5730\u5b9a\u4e49\u53d8\u91cf\uff0c\u800c\u4e14\uff0c\u5bf9\u4e8e\u53d8\u91cf\u7684\u4e2a\u522b\u5c5e\u6027\u5374\u4e0d\u5bb9\u6613\u63a7\u5236\uff0c\u6bd4\u5982\uff0c\u53d8\u91cf\u7684\u7c7b\u578b\u548c\u8bfb\u5199\u5c5e\u6027\u7b49\u3002\u4e3a\u4e86\u66f4\u597d\u5730\u63a7\u5236\u53d8\u91cf\u7684\u76f8\u5173\u5c5e\u6027\uff0cbash\u63d0\u4f9b\u4e86\u4e00\u4e2a\u540d\u79f0\u4e3adeclare\u7684\u547d\u4ee4\u6765\u7533\u660e\u53d8\u91cf\uff0c\u8be5\u547d\u4ee4\u7684\u57fa\u672c\u53e5\u578b\u5982\u4e0b\uff1a<\/p>\n
\u547d\u4ee4\u89e3\u91ca\u5668\u6709\u54ea\u4e9b_\u547d\u4ee4\u89e3\u91ca\u5668\u6709\u54ea\u4e24\u79cd_linux\u547d\u4ee4\u89e3\u91ca\u5668\u6709\u54ea\u4e9b<\/p>\n
linux\u547d\u4ee4\u89e3\u91ca\u5668\u6709\u54ea\u4e9b_\u547d\u4ee4\u89e3\u91ca\u5668\u6709\u54ea\u4e9b_\u547d\u4ee4\u89e3\u91ca\u5668\u6709\u54ea\u4e24\u79cd<\/p>\n
\u547d\u4ee4\u89e3\u91ca\u5668\u6709\u54ea\u4e9b_linux\u547d\u4ee4\u89e3\u91ca\u5668\u6709\u54ea\u4e9b_\u547d\u4ee4\u89e3\u91ca\u5668\u6709\u54ea\u4e24\u79cd<\/p>\n
\u4ee5\u4e0a\u7a0b\u5e8f\u7684\u6267\u884c\u7ed3\u679c\u5982\u4e0b\uff1a<\/p>\n
\u547d\u4ee4\u89e3\u91ca\u5668\u6709\u54ea\u4e9b_\u547d\u4ee4\u89e3\u91ca\u5668\u6709\u54ea\u4e24\u79cd_linux\u547d\u4ee4\u89e3\u91ca\u5668\u6709\u54ea\u4e9b<\/p>\n
\u4e0b\u8fb9\u5bf9\u6bd4\u6267\u884c\u7ed3\u679c\u5256\u6790\u4e00\u4e0b\u4ee3\u7801\u3002<\/p>\n
\u7b2c5\u884c\u4f7f\u7528\u4e00\u822c\u7684\u65b9\u6cd5\u5b9a\u4e49\u4e86\u4e00\u4e2a\u53d8\u91cfx\uff0c\u800c\u4e14\u5c06\u4e00\u4e2a\u7b97\u672f\u5f0f\u4f5c\u4e3a\u521d\u59cb\u503c\u8d4b\u7ed9\u8be5\u53d8\u91cf\u3002\u7b2c6\u884c\u8f93\u51fa\u53d8\u91cfx\u7684\u503c\u3002\u4e0a\u9762\u65e9\u5df2\u8bb2\u8fc7\uff0cShell\u4e0a\u5c06\u6240\u6709\u7684\u6570\u636e\u90fd\u770b\u505a\u662f\u5b57\u7b26\u4e32\u6765\u50a8\u5b58\u7684\uff0c\u6240\u4ee5\u5728\u7a0b\u5e8f\u6267\u884c\u7684\u65f6\u4faf\uff0cShell\u5e76\u4e0d\u5c066\/3\u5f53\u4f5c\u4e00\u4e2a\u5c06\u88ab\u6c42\u503c\u7684\u7b97\u672f\u5f0f\uff0c\u800c\u662f\u4f5c\u4e3a\u4e00\u4e2a\u666e\u901a\u7684\u5b57\u7b26\u4e32\uff0c\u6240\u4ee5\u7b2c6\u884c\u76f4\u63a5\u8f93\u51fa\u4e86\u8fd9\u4e2a\u7b97\u672f\u5f0f\u672c\u8eab\uff0c\u5f97\u5230\u4e86\u7ed3\u679c\u7684\u7b2c2\u884c\u3002<\/p>\n
\u4ee3\u7801\u7684\u7b2c8\u884c\u4f7f\u7528declare\u53e5\u5b50\u7533\u660e\u4e86\u53d8\u91cfx\u4e3a\u6574\u6570\uff0c\u800c\u4e14\u7a0b\u5e8f\u5e76\u6ca1\u5bf9\u53d8\u91cfx\u91cd\u65b0\u5f62\u53c2\uff0c\u6240\u4ee5\u7b2c9\u884c\u7684echo\u53e5\u5b50\u7684\u6267\u884c\u7ed3\u679c\u4f9d\u7136\u5f97\u5230\u7b97\u672f\u5f0f\u672c\u8eab\uff0c\u5373\u7ed3\u679c\u7684\u7b2c3\u884c\u3002<\/p>\n
\u4ee3\u7801\u7684\u7b2c11\u884c\u5bf9\u53d8\u91cfx\u91cd\u65b0\u5f62\u53c2\uff0c\u5c06\u540e\u9762\u7684\u7b97\u672f\u8868\u8fbe\u5f0f\u8d4b\u7ed9\u5b83\u3002\u7531\u4e8e\u5f53\u53d8\u91cf\u88ab\u7533\u660e\u4e3a\u6574\u6570\u4ee5\u540e\uff0c\u53ef\u4ee5\u76f4\u63a5\u53c2\u4e0e\u7b97\u672f\u8fd0\u7b97\uff0c\u6240\u4ee5\u7b2c12\u884c\u7684echo\u53e5\u5b50\u4e2d\u8f93\u51fa\u4e86\u7b97\u672f\u5f0f\u7684\u503c\uff0c\u5373\u7ed3\u679c\u7684\u7b2c4\u884c\u3002<\/p>\n
\u7b2c14\u884c\u5c1d\u8bd5\u5c06\u4e00\u4e2a\u5b57\u7b26\u4e32\u503c\u8d4b\u7ed9\u6574\u6570\u53d8\u91cfx\uff0c\u4f46\u662f\u5728\u7b2c15\u884c\u4f7f\u7528echo\u53e5\u5b50\u8f93\u51fax\u7684\u503c\u3002\u5728Shell\u4e2d\uff0c\u5047\u5982\u53d8\u91cf\u88ab\u7533\u660e\u6210\u6574\u6570\uff0c\u628a\u4e00\u4e2a\u7ed3\u679c\u4e0d\u662f\u6574\u6570\u7684\u8868\u8fbe\u5f0f\u5f62\u53c2\u7ed9\u5b83\u65f6\uff0c\u624d\u4f1a\u5f04\u62100\u3002\u56e0\u800c\uff0c\u7ed3\u679c\u7b2c5\u884c\u4e2d\u76840\u662f\u4ee3\u7801\u7b2c15\u884c\u7684echo\u53e5\u5b50\u7684\u8f93\u51fa\u3002<\/p>\n
\u7b2c17\u884c\u5c06\u4e00\u4e2a\u6d6e\u70b9\u6570\u8d4b\u7ed9\u53d8\u91cfx\uff0c\u7531\u4e8ebash\u5e76\u4e0d\u5916\u7f6e\u5bf9\u6d6e\u70b9\u6570\u7684\u652f\u6301\uff0c\u6240\u4ee5\u5f97\u5230\u4e86\u6267\u884c\u7ed3\u679c\u4e2d\u7684\u7b2c6\u884c\u7684\u9519\u8bef\u6d88\u606f\uff0c\u6b64\u65f6\uff0c\u53d8\u91cfx\u7684\u503c\u53d8\u4e3a0\uff0c\u5373\u7ed3\u679c\u7684\u7b2c7\u884c\u4e2d\u76840\u3002<\/p>\n
\u7b2c20\u884c\u53d6\u6d88\u53d8\u91cfx\u7684\u6574\u6570\u7c7b\u578b\u5c5e\u6027\uff0c\u7b2c22\u884c\u91cd\u65b0\u5c06\u7b97\u672f\u5f0f\u8d4b\u7ed9\u53d8\u91cfx\uff0c\u4f46\u662f\u5728\u7b2c23\u884c\u4f7f\u7528echo\u53e5\u5b50\u8f93\u51fa\u53d8\u91cfx\u7684\u503c\u3002\u56e0\u4e3a\u6b64\u65f6\u53d8\u91cfx\u65e9\u5df2\u4e0d\u662f\u6574\u6570\u53d8\u91cf\uff0c\u6240\u4ee5\u4e0d\u80fd\u76f4\u63a5\u53c2\u6570\u7b97\u672f\u8fd0\u7b97\u3002\u56e0\u800c\uff0c\u53d8\u91cfx\u7684\u503c\u4f9d\u7136\u5f97\u5230\u4e86\u7b97\u672f\u5f0f\u672c\u8eab\uff0c\u5373\u7ed3\u679c\u7684\u7b2c8\u884c\u3002<\/p>\n
\u5728Shell\u4e2d\uff0c\u4e3a\u4e86\u5f97\u5230\u7b97\u672f\u5f0f\u7684\u503c\uff0c\u53ef\u4ee5\u6709\u4e24\u79cd\u65b9\u5f0f\uff0c\u5176\u4e2d\u4e00\u79cd\u5c31\u662f\u4f7f\u7528\u65b9\u62ec\u5f27\uff0c\u5373\u7b2c25\u884c\u4e2d\u7684\u5f62\u5f0f\u3002\u7ed3\u679c\u7684\u7b2c9\u884c\u6b63\u662f\u6b64\u65f6\u53d8\u91cfx\u7684\u503c\u3002\u53e6\u5916\u4e00\u79cd\u662f\u4f7f\u7528\u5706\u62ec\u5f27\uff0c\u5373\u7b2c28\u884c\u4e2d\u7684\u5f62\u5f0f\u3002\u4ece\u6267\u884c\u7ed3\u679c\u53ef\u4ee5\u83b7\u77e5\uff0c\u8fd9\u4e24\u79cd\u5f62\u5f0f\u90fd\u53ef\u4ee5\u5f97\u5230\u7528\u6237\u6240\u671f\u671b\u7684\u7ed3\u679c\u3002<\/p>\n
\u7b2c31\u884c\u4f7f\u7528r\u9009\u9879\u7533\u660e\u4e86\u4e00\u4e2a\u53ea\u8bfb\u53d8\u91cf\uff0c\u7b2c43\u884c\u5c1d\u8bd5\u4e3a\u8be5\u53d8\u91cf\u91cd\u65b0\u5f62\u53c2\uff0c\u56e0\u800c\u5f97\u5230\u4e86\u7ed3\u679c\u4e2d\u7b2c12\u884c\u7684\u9519\u8bef\u6d88\u606f\u3002\u6b64\u65f6\u53d8\u91cfx\u7684\u503c\u4f9d\u7136\u662f2\uff0c\u6240\u4ee5\u624d\u6709\u7ed3\u679c\u4e2d\u7684\u7b2c13\u884c\u3002<\/p>\n
\u53d8\u91cf\u548c\u5192\u53f7<\/p>\n
Shell\u53d8\u91cf\u4e2d\u7684\u7b26\u53f7\u201c$\u201d\u8868\u793a\u53d6\u53d8\u91cf\u7684\u503c\u3002\u53ea\u6709\u5728\u53d6\u503c\u7684\u65f6\u4faf\u624d\u4f7f\u7528\uff0c\u5b9a\u4e49\u548c\u5f62\u53c2\u65f6\u65e0\u9700\u4f7f\u7528\u7b26\u53f7\u201c$\u201d\u3002\u53e6\u5916\uff0c\u5b9e\u9645\u4e0aShell\u4e2d\u53d8\u91cf\u7684\u539f\u578b\u4e3a${var}\uff0c\u800c\u5e38\u7528\u7684\u4e66\u5199\u65b9\u5f0f$var\u53ea\u662f\u4e00\u4e2a\u7f29\u5199\u3002\u5728\u4e2a\u522b\u60c5\u51b5\u4e0b\uff0c\u7f29\u5199\u65b9\u5f0f\u4f1a\u9020\u6210\u7a0b\u5e8f\u6267\u884c\u9519\u8bef\u3002<\/p>\n
Shell\u8bed\u8a00\u4e2d\u4e00\u5171\u67093\u79cd\u5192\u53f7\uff0c\u5206\u522b\u4e3a\u5355\u5192\u53f7\uff08\u201d\uff09\u3001\u53cc\u5192\u53f7\uff08\u201d\u201d\uff09\u548c\u53cd\u5192\u53f7\uff08\u201c\uff09\u3002\u8fd93\u79cd\u5192\u53f7\u7684\u4f5c\u7528\u662f\u4e0d\u540c\u7684\uff0c\u5176\u5bf9\u7ebf\u5192\u53f7\u62ec\u4e0a\u53bb\u7684\u5b57\u7b26\u90fd\u4f5c\u4e3a\u666e\u901a\u5b57\u7b26\u51fa\u73b0\uff1b\u7531\u53cc\u5192\u53f7\u62ec\u4e0a\u53bb\u7684\u5b57\u7b26\uff0c\u9664\u201c$\u201d\u3001\u201c\u201d\u3001\u201c\u2019\u201d\u548c\u201c\u201d\u201d\u8fd9\u51e0\u4e2a\u5b57\u7b26\u4ecd\u662f\u7279\u6b8a\u5b57\u7b26\u5e76\u4fdd\u7559\u5176\u7279\u6b8a\u529f\u80fd\u5916\uff0c\u5176\u4f59\u5b57\u7b26\u4ecd\u4f5c\u4e3a\u666e\u901a\u5b57\u7b26\u5bf9\u5f85\uff1b\u7531\u53cd\u5192\u53f7\u62ec\u4e0a\u53bb\u7684\u5b57\u4e32\u88abShell\u89e3\u91ca\u4e3a\u547d\u4ee4\uff0c\u5728\u6267\u884c\u65f6\uff0cShell\u9996\u5148\u6267\u884c\u8be5\u547d\u4ee4\uff0c\u5e76\u4ee5\u5b83\u7684\u6807\u51c6\u8f93\u51fa\u7ed3\u679c\u4ee3\u66ff\u6574\u4e2a\u53cd\u5192\u53f7\uff08\u5305\u62ec\u4e24\u4e2a\u53cd\u5192\u53f7\uff09\u90e8\u4efd\u3002<\/p>\n
\u53d8\u91cf\u7684\u4f5c\u7528\u57df<\/p>\n
1\u3001\u5168\u5c40\u53d8\u91cf<\/p>\n
\u4e00\u822c\u89c9\u5f97\uff0c\u5168\u5c40\u53d8\u91cf\u662f\u4f7f\u7528\u8303\u56f4\u8f83\u5927\u7684\u53d8\u91cf\uff0c\u5b83\u9664\u4e86\u9650\u4e8e\u67d0\u4e2a\u5c40\u90e8\u4f7f\u7528\u3002\u5728Shell\u8bed\u8a00\u4e2d\uff0c\u5168\u5c40\u53d8\u91cf\u53ef\u4ee5\u5728\u811a\u672c\u4e2d\u5b9a\u4e49\uff0c\u4e5f\u53ef\u4ee5\u5728\u67d0\u4e2a\u51fd\u6570\u4e2d\u5b9a\u4e49\u3002\u5728\u811a\u672c\u4e2d\u5b9a\u4e49\u7684\u53d8\u91cf\u90fd\u662f\u5168\u5c40\u53d8\u91cf\uff0c\u5176\u4f5c\u7528\u57df\u4e3a\u4ece\u88ab\u5b9a\u4e49\u7684\u5730\u65b9\u5f00\u59cb\uff0c\u4ecd\u7136\u5230Shell\u811a\u672c\u7ed3\u675f\u6216\u5219\u88ab\u663e\u5f0f\u5730\u5220\u6389\u3002<\/p>\n
\u4e0d\u4ec5\u5728\u811a\u672c\u4e2d\u5b9a\u4e49\u5168\u5c40\u53d8\u91cf\u4e4b\u5916\uff0c\u5728\u51fd\u6570\u5185\u90e8\u5b9a\u4e49\u7684\u53d8\u91cf\u9ed8\u8ba4\u60c5\u51b5\u4e0b\u4e5f\u662f\u5168\u5c40\u53d8\u91cf\uff0c\u5176\u4f5c\u7528\u57df\u4e3a\u4ece\u51fd\u6570\u88ab\u8c03\u7528\u65f6\u6267\u884c\u53d8\u91cf\u5b9a\u4e49\u7684\u5730\u65b9\u5f00\u59cb\uff0c\u4ecd\u7136\u5230Shell\u811a\u672c\u7ed3\u675f\u6216\u5219\u88ab\u663e\u5f0f\u5730\u5220\u6389\u4e3a\u6b62\u3002<\/p>\n
2\u3001\u5c40\u90e8\u53d8\u91cf<\/p>\n
\u4e0e\u5168\u5c40\u53d8\u91cf\u76f8\u6bd4\uff0c\u5c40\u90e8\u53d8\u91cf\u7684\u4f7f\u7528\u8303\u56f4\u8f83\u5c0f\uff0c\u4e00\u822c\u4ec5\u9650\u4e8e\u67d0\u4e2a\u7a0b\u5e8f\u6bb5\u8bbf\u95ee\uff0c\u6bd4\u5982\u51fd\u6570\u5185\u90e8\u3002\u5728Shell\u8bed\u8a00\u4e2d\uff0c\u53ef\u4ee5\u5728\u51fd\u6570\u5185\u90e8\u901a\u8fc7local\u5173\u952e\u5b57\u5b9a\u4e49\u5c40\u90e8\u53d8\u91cf\uff0c\u53e6\u5916\uff0c\u51fd\u6570\u7684\u53c2\u6570\u4e5f\u662f\u5c40\u90e8\u53d8\u91cf\u3002<\/p>\n
\u7cfb\u7edf\u53d8\u91cf<\/p>\n
linux\u547d\u4ee4\u89e3\u91ca\u5668\u6709\u54ea\u4e9b_\u547d\u4ee4\u89e3\u91ca\u5668\u6709\u54ea\u4e24\u79cd_\u547d\u4ee4\u89e3\u91ca\u5668\u6709\u54ea\u4e9b<\/p>\n
\u73af\u5883\u53d8\u91cf<\/p>\n
\u4f9d\u7167\u60ef\u4f8b\uff0cShell\u4e2d\u7684\u73af\u5883\u53d8\u91cf\u5168\u90e8\u4f7f\u7528\u5c0f\u5199\u5b57\u6bcd\u8868\u793a\u3002<\/p>\n
linux\u547d\u4ee4\u89e3\u91ca\u5668\u6709\u54ea\u4e9b_\u547d\u4ee4\u89e3\u91ca\u5668\u6709\u54ea\u4e9b_\u547d\u4ee4\u89e3\u91ca\u5668\u6709\u54ea\u4e24\u79cd<\/p>\n
\u547d\u4ee4\u89e3\u91ca\u5668\u6709\u54ea\u4e9b_linux\u547d\u4ee4\u89e3\u91ca\u5668\u6709\u54ea\u4e9b_\u547d\u4ee4\u89e3\u91ca\u5668\u6709\u54ea\u4e24\u79cd<\/p>\n
\u6f14\u793a\u901a\u8fc7\u73af\u5883\u53d8\u91cf\u6765\u83b7\u53d6\u4e0e\u5f53\u524dShell\u6709\u5173\u7684\u4e00\u4e9b\u73af\u5883\u53d8\u91cf\u7684\u503c\uff0c\u4ee3\u7801\u5982\u4e0b\uff1a<\/p>\n
\u547d\u4ee4\u89e3\u91ca\u5668\u6709\u54ea\u4e24\u79cd_linux\u547d\u4ee4\u89e3\u91ca\u5668\u6709\u54ea\u4e9b_\u547d\u4ee4\u89e3\u91ca\u5668\u6709\u54ea\u4e9b<\/p>\n
\u53d8\u91cf\u5f62\u53c2<\/p>\n
\u4e00\u4e2a\u6ca1\u6709\u521d\u59cb\u5316\u7684Shell\u53d8\u91cf\u88ab\u89c9\u5f97\u662f\u4e00\u4e2a\u7a7a\u5b57\u7b26\u4e32\u3002\u7528\u6237\u53ef\u4ee5\u901a\u8fc7\u53d8\u91cf\u7684\u5f62\u53c2\u64cd\u4f5c\u6765\u5b8c\u6210\u53d8\u91cf\u7684\u7533\u660e\u5e76\u8d4b\u4e8e\u4e00\u4e2a\u7279\u5b9a\u7684\u503c\u3002\u800c\u4e14\u53ef\u4ee5\u901a\u8fc7\u5f62\u53c2\u53e5\u5b50\u4e3a\u4e00\u4e2a\u53d8\u91cf\u591a\u6b21\u5f62\u53c2\uff0c\u4ee5\u6539\u53d8\u5176\u503c\u3002<\/p>\n
\u901a\u5e38\u60c5\u51b5\u4e0b\uff0cShell\u4e0a\u5c06\u6240\u6709\u666e\u901a\u53d8\u91cf\u7684\u503c\u90fd\u770b\u505a\u5b57\u7b26\u4e32\u3002\u5047\u5982value\u4e2d\u5305\u542b\u7a7a\u683c\u3001\u5236\u8868\u7b26\u548c\u6362\u884c\u7b26\uff0c\u5219\u5fc5\u987b\u7528\u5355\u5192\u53f7\u6216\u5219\u53cc\u5192\u53f7\u5c06\u5176\u9020\u6210\u6765\u3002\u53cc\u5192\u53f7\u5185\u5bb9\u8bb8\u53d8\u91cf\u66ff\u6362\uff0c\u800c\u5355\u5192\u53f7\u5219\u4e0d\u53ef\u4ee5\u3002\u4e2d\u95f4\u7684\u7b49\u4e8e\u53f7\u201c=\u201d\u79f0\u4e3a\u5f62\u53c2\u7b26\u53f7\uff0c\u5f62\u53c2\u7b26\u53f7\u7684\u5de6\u53f3\u4e24\u4fa7\u4e0d\u80fd\u76f4\u63a5\u8ddf\u7a7a\u683c\uff0c\u5426\u5219Shell\u4f1a\u5c06\u5176\u89c6\u4e3a\u547d\u4ee4\u3002<\/p>\n
\u5f15\u7528\u53d8\u91cf\u7684\u503c<\/p>\n
\u5728Shell\u4e2d\uff0c\u7528\u6237\u53ef\u4ee5\u901a\u8fc7\u5728\u53d8\u91cf\u540d\u540e\u9762\u52a0\u4e0a\u201c$\u201d\u6765\u83b7\u53d6\u8be5\u53d8\u91cf\u7684\u503c\u3002\u8bf8\u5982\uff1a$str\u3002<\/p>\n
\u4e3a\u4e86\u624d\u80fd\u4f7fShell\u6b63\u786e\u5730\u5212\u5206\u53d8\u91cf\u540d\uff0c\u9632\u6b62\u6df7\u6dc6\uff0c\u7528\u6237\u5728\u5f15\u7528\u53d8\u91cf\u65f6\u53ef\u4ee5\u4f7f\u7528\u5927\u62ec\u5f27\u5c06\u53d8\u91cf\u540d\u62ec\u4e0a\u53bb\u3002\u8bf8\u5982\uff1a${str}abc\u3002<\/p>\n
\u53bb\u9664\u53d8\u91cf<\/p>\n
\u4f7f\u7528unset\u53e5\u5b50\uff1aunsetvaricable_name<\/p>\n
\u5f15\u7528\u7b26\u53f7<\/p>\n
linux\u547d\u4ee4\u89e3\u91ca\u5668\u6709\u54ea\u4e9b_\u547d\u4ee4\u89e3\u91ca\u5668\u6709\u54ea\u4e9b_\u547d\u4ee4\u89e3\u91ca\u5668\u6709\u54ea\u4e24\u79cd<\/p>\n
\u547d\u4ee4\u66ff\u6362<\/p>\n
\u6240\u8c13\u547d\u4ee4\u66ff\u6362\uff0c\u662f\u6307\u5728Shell\u7a0b\u5e8f\u4e2d\uff0c\u5c06\u67d0\u4e2aShell\u547d\u4ee4\u7684\u6267\u884c\u7ed3\u679c\u8d4b\u7ed9\u67d0\u4e2a\u53d8\u91cf\u3002\u5728bash\u4e2d\uff0c\u6709\u4e24\u79cd\u53e5\u578b\u53ef\u4ee5\u8fdb\u884c\u547d\u4ee4\u66ff\u6362\uff0c\u5206\u522b\u4f7f\u7528\u53cd\u5192\u53f7\u548c\u5706\u62ec\u5f27\uff0c\u5982\u4e0b\uff1a<\/p>\n
`shell_command`\u6216\u5219$(shell_command)<\/p>\n
\u6761\u4ef6\u6d4b\u8bd5<\/p>\n
\u5728Shell\u7a0b\u5e8f\u4e2d\uff0c\u7528\u6237\u53ef\u4ee5\u4f7f\u7528\u6d4b\u8bd5\u53e5\u5b50\u6765\u6d4b\u8bd5\u6307\u5b9a\u7684\u6761\u4ef6\u8868\u8fbe\u5f0f\u7684\u6761\u4ef6\u7684\u771f\u6216\u5219\u5047\u3002\u5f53\u6307\u5b9a\u7684\u6761\u4ef6\u4e3a\u771f\u65f6\uff0c\u6574\u4e2a\u6761\u4ef6\u6d4b\u8bd5\u7684\u8fd4\u56de\u503c\u4e3a0\uff1b\u53cd\u4e4b\uff0c\u5047\u5982\u6307\u5b9a\u7684\u6761\u4ef6\u4e3a\u5047\uff0c\u5219\u6761\u4ef6\u6d4b\u8bd5\u53e5\u5b50\u7684\u8fd4\u56de\u503c\u4e3a\u975e0\u503c\u3002<\/p>\n
\u6ce8\u610f\uff1a\u5728Shell\u7a0b\u5e8f\u4e2d\uff0c\u6761\u4ef6\u6d4b\u8bd5\u4e2d\u7684\u6307\u5b9a\u6761\u4ef6\u4e3a\u771f\u65f6\uff0c\u6761\u4ef6\u6d4b\u8bd5\u7684\u8fd4\u56de\u503c\u4e3a0\u3002\u8fd9\u4e3b\u8981\u662f\u4e3a\u4e86\u4fdd\u6301\u4e0eShell\u7a0b\u5e8f\u7684\u9000\u51fa\u72b6\u6001\u4e00\u81f4\u3002\u5f53\u67d0\u4e2aShell\u7a0b\u5e8f\u6210\u529f\u6267\u884c\u540e\uff0c\u8be5\u8fdb\u7a0b\u4f1a\u8fd4\u56de\u4e00\u4e2a0\u503c\uff1b\u800c\u5047\u5982\u8be5\u7a0b\u5e8f\u6267\u884c\u9519\u8bef\uff0c\u5219\u4f1a\u8fd4\u56de\u4e00\u4e2a\u975e0\u503c\u3002<\/p>\n
\u6761\u4ef6\u6d4b\u8bd5\u7684\u53e5\u578b\u6709\u4e24\u79cd\uff0c\u5206\u522b\u662ftest\u547d\u4ee4\u548c[\u547d\u4ee4\uff0c\u4e0b\u8fb9\u5bf9\u8fd9\u4e24\u79cd\u53e5\u578b\u8fdb\u884c\u4ecb\u7ecd\u3002<\/p>\n
test\u547d\u4ee4\u7684\u53e5\u578b\u5982\u4e0b\uff1a<\/p>\n
testexpression<\/p>\n
\u547d\u4ee4\u89e3\u91ca\u5668\u6709\u54ea\u4e9b_\u547d\u4ee4\u89e3\u91ca\u5668\u6709\u54ea\u4e24\u79cd_linux\u547d\u4ee4\u89e3\u91ca\u5668\u6709\u54ea\u4e9b<\/p>\n
[\u547d\u4ee4\u7684\u53e5\u578b\u5982\u4e0b\uff1a<\/p>\n
[expression]<\/p>\n
\u5b57\u7b26\u4e32\u6d4b\u8bd5<\/p>\n
\u547d\u4ee4\u89e3\u91ca\u5668\u6709\u54ea\u4e9b_linux\u547d\u4ee4\u89e3\u91ca\u5668\u6709\u54ea\u4e9b_\u547d\u4ee4\u89e3\u91ca\u5668\u6709\u54ea\u4e24\u79cd<\/p>\n
\u6574\u6570\u6d4b\u8bd5<\/p>\n
linux\u547d\u4ee4\u89e3\u91ca\u5668\u6709\u54ea\u4e9b_\u547d\u4ee4\u89e3\u91ca\u5668\u6709\u54ea\u4e9b_\u547d\u4ee4\u89e3\u91ca\u5668\u6709\u54ea\u4e24\u79cd<\/p>\n
\u3001<\/p>\n
\u547d\u4ee4\u89e3\u91ca\u5668\u6709\u54ea\u4e9b_\u547d\u4ee4\u89e3\u91ca\u5668\u6709\u54ea\u4e24\u79cd_linux\u547d\u4ee4\u89e3\u91ca\u5668\u6709\u54ea\u4e9b<\/p>\n
\u5bf9\u4e8e\u521d\u5b66\u8005\u6765\u8bf4\uff0c\u65f6\u5e38\u72af\u7684\u4e00\u4e2a\u9519\u8bef\u5c31\u662f\u9519\u8bef\u5730\u4f7f\u7528\u8fd0\u7b97\u7b26\u3002\u5728\u8fdb\u884c\u6574\u6570\u6bd4\u8f83\u7684\u65f6\u4faf\uff0c\u4e00\u5b9a\u8981\u662f\u6574\u6570\u7684\u8fd0\u7b97\u7b26\u3002\u5e76\u4e14\uff0c\u56e0\u4e3a\u906d\u5230\u5176\u4ed6\u7a0b\u5e8f\u8bbe\u8ba1\u8bed\u8a00\u7684\u5f71\u54cd\uff0c\u521d\u5b66\u8005\u53ef\u80fd\u4f1a\u4f7f\u7528\u5b57\u7b26\u4e32\u8fd0\u7b97\u7b26\u4e2d\u7684\u201c=\u201d\u548c\u201c!=\u201d\u6765\u8fdb\u884c\u6574\u6570\u6bd4\u8f83\u3002<\/p>\n
\u6587\u4ef6\u6d4b\u8bd5<\/p>\n
linux\u547d\u4ee4\u89e3\u91ca\u5668\u6709\u54ea\u4e9b_\u547d\u4ee4\u89e3\u91ca\u5668\u6709\u54ea\u4e24\u79cd_\u547d\u4ee4\u89e3\u91ca\u5668\u6709\u54ea\u4e9b<\/p>\n
\u903b\u8f91\u64cd\u4f5c\u7b26<\/p>\n
linux\u547d\u4ee4\u89e3\u91ca\u5668\u6709\u54ea\u4e9b_\u547d\u4ee4\u89e3\u91ca\u5668\u6709\u54ea\u4e9b_\u547d\u4ee4\u89e3\u91ca\u5668\u6709\u54ea\u4e24\u79cd<\/p>\n
\u6761\u4ef6\u5224\u5b9a\u53e5\u5b50<\/p>\n
\u547d\u4ee4\u89e3\u91ca\u5668\u6709\u54ea\u4e24\u79cd_linux\u547d\u4ee4\u89e3\u91ca\u5668\u6709\u54ea\u4e9b_\u547d\u4ee4\u89e3\u91ca\u5668\u6709\u54ea\u4e9b<\/p>\n
\u5728Shell\u7a0b\u5e8f\u4e2d\uff0c\u5047\u5982\u60f3\u8981\u5c06\u591a\u6761\u547d\u4ee4\u7f6e\u4e8e\u540c\u4e00\u884c\u4e2d\uff0c\u5219\u987b\u8981\u4f7f\u7528\u5206\u53f7\u5c06\u5176\u9694\u5f00\u3002<\/p>\n
\u5f53\u6211\u4eec\u5728Shell\u7a0b\u5e8f\u4e2d\u4f7f\u7528\u4ee3\u7801\u521b\u5efa\u6216\u5219\u66f4\u6539\u67d0\u4e2a\u6587\u4ef6\u7684\u65f6\u4faf\uff0c\u9996\u5148\u5224\u5b9a\u4e00\u4e0b\u6587\u4ef6\u662f\u5426\u521b\u5efa\u6210\u529f\uff0c\u6216\u5219\u5224\u5b9a\u6587\u4ef6\u662f\u5426\u5b58\u5728\u662f\u4e00\u4e2a\u5341\u5206\u597d\u7684\u4e60\u60ef\u3002<\/p>\n
\u5728Shell\u4e2d\uff0c\u8fd8\u6709\u4e00\u4e2a\u7279\u6b8a\u7684\u547d\u4ee4\uff0c\u79f0\u4e3a\u7a7a\u547d\u4ee4\uff0c\u5176\u8868\u793a\u65b9\u5f0f\u662f\u4e00\u4e2a\u9017\u53f7\u201c:\u201d\uff0c\u8be5\u547d\u4ee4\u4e0d\u505a\u4efb\u4f55\u4e8b\u60c5\uff0c\u800c\u4e14\u5b83\u7684\u9000\u51fa\u72b6\u6001\u6c38\u8fdc\u662f0\u3002\u56e0\u800c\uff0c\u5047\u5982\u6211\u4eec\u5c06\u8be5\u547d\u4ee4\u4f5c\u4e3aif\u53e5\u5b50\u4e2d\u7684\u6761\u4ef6\uff0c\u5219\u4f1a\u6c38\u8fdc\u6267\u884cthen\u8c13\u8bcd\uff0c\u5982\u4e0b\u8fb9\u7684\u4e8b\u4f8b\u6240\u793a\u3002<\/p>\n
\u5728\u5b9e\u9645\u7684\u7f16\u7a0b\u4e2d\uff0c\u6709\u4eba\u559c\u6b22\u4f7f\u7528&&\u64cd\u4f5c\u7b26\u6765\u53d6\u4ee3if\u53e5\u5b50\uff0c\u5982\u4e0b\u8fb9\u7684\u4e8b\u4f8b\u6240\u793a\u3002<\/p>\n
linux\u547d\u4ee4\u89e3\u91ca\u5668\u6709\u54ea\u4e9b_\u547d\u4ee4\u89e3\u91ca\u5668\u6709\u54ea\u4e24\u79cd_\u547d\u4ee4\u89e3\u91ca\u5668\u6709\u54ea\u4e9b<\/p>\n
\u547d\u4ee4\u89e3\u91ca\u5668\u6709\u54ea\u4e9b_\u547d\u4ee4\u89e3\u91ca\u5668\u6709\u54ea\u4e24\u79cd_linux\u547d\u4ee4\u89e3\u91ca\u5668\u6709\u54ea\u4e9b<\/p>\n
\u591a\u6761\u4ef6\u5224\u5b9a\u53e5\u5b50case<\/p>\n
\u547d\u4ee4\u89e3\u91ca\u5668\u6709\u54ea\u4e24\u79cd_\u547d\u4ee4\u89e3\u91ca\u5668\u6709\u54ea\u4e9b_linux\u547d\u4ee4\u89e3\u91ca\u5668\u6709\u54ea\u4e9b<\/p>\n
\u547d\u4ee4\u89e3\u91ca\u5668\u6709\u54ea\u4e24\u79cd_linux\u547d\u4ee4\u89e3\u91ca\u5668\u6709\u54ea\u4e9b_\u547d\u4ee4\u89e3\u91ca\u5668\u6709\u54ea\u4e9b<\/p>\n
\u5728\u524d\u9762\u7684\u53e5\u578b\u4e2d\uff0cvariable\u662f\u4e00\u4e2a\u53d8\u91cf\uff0ccase\u53e5\u5b50\u4f1a\u5c06\u8be5\u53d8\u91cf\u7684\u503c\u4e0evalue1\uff5evaluen\u4e2d\u7684\u6bcf\u4f4d\u503c\u76f8\u6bd4\u8f83\uff0c\u5047\u82e5\u4e0e\u67d0\u4e2avalue\u7684\u503c\u76f8\u7b49\uff0c\u5219\u6267\u884c\u8be5value\u6240\u5bf9\u5e94\u7684\u4e00\u7ec4\u53e5\u5b50\u3002\u5f53\u9047\u89c1\u201c;;\u201d\u7b26\u53f7\u65f6\uff0c\u5c31\u8df3\u51facase\u53e5\u5b50\u7ea2\u5e3d\u5b50linux\uff0c\u6267\u884cesac\u53e5\u5b50\u524d\u9762\u7684\u53e5\u5b50\u3002\u82e5\u679c\u6ca1\u6709\u4efb\u4f55\u4e00\u4e2a\u503c\u4e0evariable\u7684\u503c\u76f8\u5339\u914d\uff0c\u5219\u6267\u884c*\u65c1\u8fb9\u7684\u4e00\u7ec4\u53e5\u5b50\u3002<\/p>\n
\u5bf9\u4e8e\u524d\u9762\u7684case\u53e5\u5b50\uff0c\u7528\u6237\u5e94\u5f53\u6ce8\u610f\u4ee5\u4e0b\u51e0\u70b9\uff1a<\/p>\n
\u8fd0\u7b97\u7b26<\/p>\n
\u547d\u4ee4\u89e3\u91ca\u5668\u6709\u54ea\u4e24\u79cd_\u547d\u4ee4\u89e3\u91ca\u5668\u6709\u54ea\u4e9b_linux\u547d\u4ee4\u89e3\u91ca\u5668\u6709\u54ea\u4e9b<\/p>\n
linux\u547d\u4ee4\u89e3\u91ca\u5668\u6709\u54ea\u4e9b_\u547d\u4ee4\u89e3\u91ca\u5668\u6709\u54ea\u4e9b_\u547d\u4ee4\u89e3\u91ca\u5668\u6709\u54ea\u4e24\u79cd<\/p>\n
\u6267\u884c\u7b97\u672f\u8fd0\u7b97<\/p>\n
\u53ef\u4ee5\u901a\u8fc74\u79cd\u5f62\u5f0f\u6765\u6267\u884c\u7b97\u672f\u8fd0\u7b97\uff0c\u8fd94\u79cd\u5f62\u5f0f\u5206\u522b\u5982\u4e0b\uff1a<\/p>\n
1\u3001\u4f7f\u7528expr\u5916\u90e8\u7a0b\u5e8f<\/p>\n
\n
expr expression<\/code><\/pre>\n<\/p>\n
2\u3001\u4f7f\u7528$((\u2026))<\/p>\n
\u547d\u4ee4\u89e3\u91ca\u5668\u6709\u54ea\u4e9b_linux\u547d\u4ee4\u89e3\u91ca\u5668\u6709\u54ea\u4e9b_\u547d\u4ee4\u89e3\u91ca\u5668\u6709\u54ea\u4e24\u79cd<\/p>\n
3\u3001\u4f7f\u7528$[\u2026]<\/p>\n
linux\u547d\u4ee4\u89e3\u91ca\u5668\u6709\u54ea\u4e9b_\u547d\u4ee4\u89e3\u91ca\u5668\u6709\u54ea\u4e24\u79cd_\u547d\u4ee4\u89e3\u91ca\u5668\u6709\u54ea\u4e9b<\/p>\n
4\u3001\u4f7f\u7528let\u547d\u4ee4<\/p>\n
\u4f7f\u7528let\u547d\u4ee4\u53ef\u4ee5\u6267\u884c\u4e00\u4e2a\u6216\u5219\u591a\u4e2a\u7b97\u672f\u8868\u8fbe\u5f0f\uff0c\u5176\u4e2d\u7684\u53d8\u91cf\u540d\u65e0\u9700\u4f7f\u7528$\u7b26\u53f7\u3002\u5047\u5982\u8868\u8fbe\u5f0f\u4e2d\u5bcc\u542b\u7a7a\u683c\u6216\u5219\u5176\u4ed6\u7279\u6b8a\u5b57\u7b26\uff0c\u5219\u5fc5\u987b\u5c06\u5176\u5f15\u7528\u4e0a\u53bb\u3002<\/p>\n
\u547d\u4ee4\u89e3\u91ca\u5668\u6709\u54ea\u4e9b_\u547d\u4ee4\u89e3\u91ca\u5668\u6709\u54ea\u4e24\u79cd_linux\u547d\u4ee4\u89e3\u91ca\u5668\u6709\u54ea\u4e9b<\/p>\n
\u4f4d\u8fd0\u7b97\u7b26<\/p>\n
linux\u547d\u4ee4\u89e3\u91ca\u5668\u6709\u54ea\u4e9b_\u547d\u4ee4\u89e3\u91ca\u5668\u6709\u54ea\u4e24\u79cd_\u547d\u4ee4\u89e3\u91ca\u5668\u6709\u54ea\u4e9b<\/p>\n
\u547d\u4ee4\u89e3\u91ca\u5668\u6709\u54ea\u4e9b_\u547d\u4ee4\u89e3\u91ca\u5668\u6709\u54ea\u4e24\u79cd_linux\u547d\u4ee4\u89e3\u91ca\u5668\u6709\u54ea\u4e9b<\/p>\n
\u81ea\u589e\/\u81ea\u51cf\u8fd0\u7b97\u7b26<\/p>\n
\u547d\u4ee4\u89e3\u91ca\u5668\u6709\u54ea\u4e24\u79cd_\u547d\u4ee4\u89e3\u91ca\u5668\u6709\u54ea\u4e9b_linux\u547d\u4ee4\u89e3\u91ca\u5668\u6709\u54ea\u4e9b<\/p>\n
\u5faa\u73af\u7ed3\u6784\u5e26\u5217\u8868\u7684for\u5faa\u73af\u53e5\u5b50<\/p>\n
\u547d\u4ee4\u89e3\u91ca\u5668\u6709\u54ea\u4e24\u79cd_linux\u547d\u4ee4\u89e3\u91ca\u5668\u6709\u54ea\u4e9b_\u547d\u4ee4\u89e3\u91ca\u5668\u6709\u54ea\u4e9b<\/p>\n
\u5728\u524d\u9762\u7684\u53e5\u578b\u4e2d\uff0cvariable\u79f0\u4e3a\u5faa\u73af\u53d8\u91cf\uff0clist\u662f\u4e00\u4e2a\u5217\u8868\uff0c\u53ef\u4ee5\u662f\u4e00\u7cfb\u5217\u7684\u6570\u5b57\u6216\u5219\u5b57\u7b26\u4e32\uff0c\u5143\u7d20\u4e4b\u95f4\u4f7f\u7528\u7a7a\u683c\u9694\u5f00\u3002do\u548cdone\u4e4b\u95f4\u7684\u6240\u6709\u7684\u53e5\u5b50\u79f0\u4e3a\u5faa\u73af\u4f53\uff0c\u5373\u5faa\u73af\u7ed3\u6784\u4e2d\u91cd\u590d\u6267\u884c\u7684\u53e5\u5b50\u3002<\/p>\n
\u547d\u4ee4\u89e3\u91ca\u5668\u6709\u54ea\u4e24\u79cd_\u547d\u4ee4\u89e3\u91ca\u5668\u6709\u54ea\u4e9b_linux\u547d\u4ee4\u89e3\u91ca\u5668\u6709\u54ea\u4e9b<\/p>\n
\u4e0d\u4ec5\u5c06\u5404\u4e2a\u6570\u5b57\u5168\u90e8\u5217\u4e3e\u4e4b\u5916\uff0c\u7528\u6237\u8fd8\u53ef\u4ee5\u4f7f\u7528\u53e6\u5916\u4e00\u79cd\u6bd4\u8f83\u7b80\u5355\u7684\u4e66\u5199\u65b9\u5f0f\uff0c\u5373\u7528\u4e00\u4e2a\u8303\u56f4\u6765\u53d6\u4ee3\u5217\u4e3e\u6240\u6709\u7684\u5143\u7d20\u3002\u8bf8\u5982\uff0c\u91cc\u9762\u76841\uff5e8\u6240\u6709\u7684\u6570\u5b57\u53ef\u4ee5\u4f7f\u7528{1\u20268}\u6765\u53d6\u4ee3\u3002<\/p>\n
\u547d\u4ee4\u89e3\u91ca\u5668\u6709\u54ea\u4e24\u79cd_\u547d\u4ee4\u89e3\u91ca\u5668\u6709\u54ea\u4e9b_linux\u547d\u4ee4\u89e3\u91ca\u5668\u6709\u54ea\u4e9b<\/p>\n
for\u53e5\u5b50\u7684\u6b65\u957f\uff0c\u5373\u5faa\u73af\u53d8\u91cf\u6bcf\u6b21\u964d\u4f4e\u7684\u503c\u90fd\u662f1\u3002\u5b9e\u9645\u4e0alinux\u4f7f\u7528\u6559\u7a0b\uff0cShell\u5bb9\u8bb8\u7528\u6237\u6307\u5b9afor\u53e5\u5b50\u7684\u6b65\u957f\u3002\u5f53\u7528\u6237\u987b\u8981\u53e6\u5916\u6307\u5b9a\u6b65\u957f\u65f6\uff0c\u5176\u57fa\u672c\u53e5\u578b\u5982\u4e0b\uff1a<\/p>\n
\u547d\u4ee4\u89e3\u91ca\u5668\u6709\u54ea\u4e9b_linux\u547d\u4ee4\u89e3\u91ca\u5668\u6709\u54ea\u4e9b_\u547d\u4ee4\u89e3\u91ca\u5668\u6709\u54ea\u4e24\u79cd<\/p>\n
\u6f14\u793a\u901a\u8fc7for\u5faa\u73af\uff0c\u5e76\u914d\u5408\u6b65\u957f\u6765\u4f30\u7b97100\u4ee5\u5185\u8d28\u6570\u7684\u548c\uff0c\u4ee3\u7801\u5982\u4e0b\uff1a<\/p>\n
\u547d\u4ee4\u89e3\u91ca\u5668\u6709\u54ea\u4e24\u79cd_\u547d\u4ee4\u89e3\u91ca\u5668\u6709\u54ea\u4e9b_linux\u547d\u4ee4\u89e3\u91ca\u5668\u6709\u54ea\u4e9b<\/p>\n
\u5728for\u5faa\u73af\u7684\u5217\u8868\u6761\u4ef6\u4e2d\uff0c\u4e0d\u4ec5\u4f7f\u7528\u6570\u5b57\u4f5c\u4e3a\u5143\u7d20\u4e4b\u5916\uff0c\u8fd8\u53ef\u4ee5\u4f7f\u7528\u5b57\u7b26\u4e32\u3002<\/p>\n
\u672c\u4f8b\u5c061\u5468\u4e2d7\u5929\u7684\u540d\u5b50\u4f5c\u4e3a\u5217\u8868\u6761\u4ef6\uff0c\u4f9d\u6b21\u8f93\u51fa\u6bcf\u665a\u7684\u540d\u79f0\u3002\u4ee3\u7801\u5982\u4e0b\uff1a<\/p>\n
\u547d\u4ee4\u89e3\u91ca\u5668\u6709\u54ea\u4e24\u79cd_linux\u547d\u4ee4\u89e3\u91ca\u5668\u6709\u54ea\u4e9b_\u547d\u4ee4\u89e3\u91ca\u5668\u6709\u54ea\u4e9b<\/p>\n
\u5047\u5982\u4f7f\u7528\u5b57\u7b26\u4e32\u4f5c\u4e3a\u5217\u8868\u5143\u7d20\uff0c\u5b9e\u9645\u4e0a\u53ef\u4ee5\u7701\u7565\u5916\u8fb9\u7684\u5927\u62ec\u5f27\u3002\u4e3a\u6b64\uff0c\u53ef\u4ee5\u66f4\u6539\u4e3a\u4ee5\u4e0b\u65b9\u5f0f\uff1a<\/p>\n
\u547d\u4ee4\u89e3\u91ca\u5668\u6709\u54ea\u4e9b_\u547d\u4ee4\u89e3\u91ca\u5668\u6709\u54ea\u4e24\u79cd_linux\u547d\u4ee4\u89e3\u91ca\u5668\u6709\u54ea\u4e9b<\/p>\n
\u5728\u540e\u9762\u7684\u4e8b\u4f8b\u4e2d\u7684for\u5faa\u73af\u4e0a\u9762\uff0c\u90fd\u662f\u76f4\u63a5\u6307\u5b9a\u5faa\u73af\u7684\u6761\u4ef6\u5217\u8868\u3002\u5b9e\u9645\u4e0a\uff0cShell\u4e2d\u7684for\u5faa\u73af\u5341\u5206\u7075\u6d3b\uff0c\u4e0d\u4ec5\u76f4\u63a5\u6307\u5b9a\u6761\u4ef6\u4e4b\u5916\uff0c\u8fd8\u53ef\u4ee5\u901a\u8fc7\u5176\u4ed6\u7684\u65b9\u6cd5\u6765\u83b7\u5f97\u6761\u4ef6\u5217\u8868\u3002\u8bf8\u5982\uff0c\u4e2a\u522bShell\u547d\u4ee4\u4f1a\u8f93\u51fa\u4e00\u4e2a\u5217\u8868\u3002\u5176\u4e2dlinux\u547d\u4ee4\u89e3\u91ca\u5668\u6709\u54ea\u4e9b<\/strong>\uff0c\u6700\u5e38\u89c1\u7684\u547d\u4ee4\u5c31\u662fls\u547d\u4ee4\uff0c\u8be5\u547d\u4ee4\u53ef\u4ee5\u5217\u4e3e\u67d0\u4e2a\u76ee\u5f55\u4e0b\u8fb9\u7684\u6587\u4ef6\u6e05\u5355\u3002<\/p>\n
\u547d\u4ee4\u89e3\u91ca\u5668\u6709\u54ea\u4e24\u79cd_\u547d\u4ee4\u89e3\u91ca\u5668\u6709\u54ea\u4e9b_linux\u547d\u4ee4\u89e3\u91ca\u5668\u6709\u54ea\u4e9b<\/p>\n
\u5217\u8868for\u5faa\u73af\u8fd8\u6709\u4e00\u4e2a\u6bd4\u8f83\u91cd\u8981\u7684\u7528\u9014\u5c31\u662f\u5904\u7406\u811a\u672c\u7684\u53c2\u6570\u3002\u4e0a\u9762\u8bb2\u8fc7\uff0c\u7528\u6237\u53ef\u4ee5\u901a\u8fc7\u7cfb\u7edf\u53d8\u91cf\u201c$*\u201d\u4e00\u6b21\u83b7\u53d6\u6240\u6709\u7684\u53c2\u6570\uff0c\u800c\u4e14\uff0c\u8fd9\u79cd\u53c2\u6570\u503c\u4e4b\u95f4\u662f\u901a\u8fc7\u7a7a\u683c\u9694\u5f00\u7684\uff0c\u6240\u4ee5\uff0c\u7528\u6237\u540c\u6837\u53ef\u4ee5\u5c06\u8be5\u7cfb\u7edf\u53d8\u91cf\u83b7\u53d6\u7684\u53c2\u6570\u503c\u4f5c\u4e3afor\u5faa\u73af\u7684\u6761\u4ef6\u5217\u8868\uff0c\u56e0\u800c\u53ef\u4ee5\u4f9d\u6b21\u5904\u7406\u5404\u4e2a\u53c2\u6570\u3002<\/p>\n
linux\u547d\u4ee4\u89e3\u91ca\u5668\u6709\u54ea\u4e9b_\u547d\u4ee4\u89e3\u91ca\u5668\u6709\u54ea\u4e9b_\u547d\u4ee4\u89e3\u91ca\u5668\u6709\u54ea\u4e24\u79cd<\/p>\n
\u547d\u4ee4\u89e3\u91ca\u5668\u6709\u54ea\u4e9b_linux\u547d\u4ee4\u89e3\u91ca\u5668\u6709\u54ea\u4e9b_\u547d\u4ee4\u89e3\u91ca\u5668\u6709\u54ea\u4e24\u79cd<\/p>\n
\u7c7bC\u98ce\u683c\u7684for\u5faa\u73af\u53e5\u5b50<\/p>\n
\u5728Linux\u6216\u5219UNIX\u91cc\u9762\uff0cC\u6216\u5219C++\u662f\u6700\u4e3b\u6d41\u7684\u5f00\u53d1\u8bed\u8a00\u3002\u4e3a\u6b64\uff0c\u4ece\u4e8bLinux\u7cfb\u7edf\u7ba1\u7406\u7684\u7cfb\u7edf\u7ba1\u7406\u5458\u4e5f\u6216\u591a\u6216\u5c11\u5730\u63a5\u89e6\u8fc7C\u6216\u5219C++\u8bed\u8a00\u3002\u4e00\u822c\u6765\u8bf4\uff0c\u8fd9\u79cd\u4eba\u5bf9\u4e8eC\u8bed\u8a00\u7684\u53e5\u578b\u6bd4\u8f83\u719f\u6089\u3002\u4e3a\u4e86\u9002\u5e94\u8fd9\u90e8\u4efd\u7528\u6237\u7684\u4e60\u60ef\uff0cbash\u4e5f\u63d0\u4f9b\u4e86\u7c7bC\u98ce\u683c\u7684for\u5faa\u73af\u53e5\u5b50\u3002\u7c7bC\u98ce\u683c\u7684for\u5faa\u73af\u53e5\u5b50\u7684\u57fa\u672c\u53e5\u578b\u5982\u4e0b\uff1a<\/p>\n
\u547d\u4ee4\u89e3\u91ca\u5668\u6709\u54ea\u4e24\u79cd_\u547d\u4ee4\u89e3\u91ca\u5668\u6709\u54ea\u4e9b_linux\u547d\u4ee4\u89e3\u91ca\u5668\u6709\u54ea\u4e9b<\/p>\n
\u6f14\u793a\u7c7bC\u98ce\u683c\u7684for\u5faa\u73af\u53e5\u5b50\u7684\u4f7f\u7528\u65b9\u5f0f\uff0c\u4ee3\u7801\u5982\u4e0b\uff1a<\/p>\n
\u547d\u4ee4\u89e3\u91ca\u5668\u6709\u54ea\u4e24\u79cd_\u547d\u4ee4\u89e3\u91ca\u5668\u6709\u54ea\u4e9b_linux\u547d\u4ee4\u89e3\u91ca\u5668\u6709\u54ea\u4e9b<\/p>\n
\u4f7f\u7528for\u5faa\u73af\u53e5\u5b50\u5904\u7406\u94fe\u8868<\/p>\n
linux\u547d\u4ee4\u89e3\u91ca\u5668\u6709\u54ea\u4e9b_\u547d\u4ee4\u89e3\u91ca\u5668\u6709\u54ea\u4e24\u79cd_\u547d\u4ee4\u89e3\u91ca\u5668\u6709\u54ea\u4e9b<\/p>\n
\u6f14\u793a\u901a\u8fc7for\u5faa\u73af\u6765\u904d\u5386\u94fe\u8868\uff0c\u4ee3\u7801\u5982\u4e0b\uff1a<\/p>\n
\u547d\u4ee4\u89e3\u91ca\u5668\u6709\u54ea\u4e24\u79cd_\u547d\u4ee4\u89e3\u91ca\u5668\u6709\u54ea\u4e9b_linux\u547d\u4ee4\u89e3\u91ca\u5668\u6709\u54ea\u4e9b<\/p>\n
until\u5faa\u73af\u53e5\u5b50<\/p>\n
\u547d\u4ee4\u89e3\u91ca\u5668\u6709\u54ea\u4e24\u79cd_linux\u547d\u4ee4\u89e3\u91ca\u5668\u6709\u54ea\u4e9b_\u547d\u4ee4\u89e3\u91ca\u5668\u6709\u54ea\u4e9b<\/p>\n
\u5728\u524d\u9762\u7684\u53e5\u578b\u4e2d\uff0cexpression\u662f\u4e00\u4e2a\u6761\u4ef6\u8868\u8fbe\u5f0f\u3002\u5f53\u8be5\u8868\u8fbe\u5f0f\u7684\u503c\u4e0d\u4e3a0\u65f6\uff0c\u5c06\u6267\u884cdo\u548cdone\u4e4b\u95f4\u7684\u53e5\u5b50\uff1b\u5f53expression\u7684\u503c\u4e3a0\u65f6\uff0c\u5c06\u9000\u51fauntil\u5faa\u73af\u7ed3\u6784\uff0c\u7ee7\u7eed\u6267\u884cdone\u53e5\u5b50\u524d\u9762\u7684\u5176\u4ed6\u53e5\u5b50\u3002<\/p>\n
\u547d\u4ee4\u89e3\u91ca\u5668\u6709\u54ea\u4e24\u79cd_linux\u547d\u4ee4\u89e3\u91ca\u5668\u6709\u54ea\u4e9b_\u547d\u4ee4\u89e3\u91ca\u5668\u6709\u54ea\u4e9b<\/p>\n
while\u5faa\u73af\u53e5\u5b50<\/p>\n
\u547d\u4ee4\u89e3\u91ca\u5668\u6709\u54ea\u4e24\u79cd_linux\u547d\u4ee4\u89e3\u91ca\u5668\u6709\u54ea\u4e9b_\u547d\u4ee4\u89e3\u91ca\u5668\u6709\u54ea\u4e9b<\/p>\n
\u5f53while\u5faa\u73af\u7ed3\u6784\u5728\u6267\u884c\u65f6\uff0c\u4f1a\u9996\u5148\u4f30\u7b97expression\u8868\u8fbe\u5f0f\u7684\u503c\uff0c\u5047\u5982\u8868\u8fbe\u5f0f\u7684\u503c\u4e3a0\uff0c\u5219\u6267\u884c\u5faa\u73af\u4f53\u4e2d\u7684\u53e5\u5b50\uff1b\u5426\u5219\uff0c\u9000\u51fawhile\u5faa\u73af\uff0c\u6267\u884cdone\u5173\u952e\u5b57\u524d\u9762\u7684\u53e5\u5b50\u3002\u5f53\u5faa\u73af\u4f53\u4e2d\u7684\u53e5\u5b50\u6267\u884c\u5b8c\u6210\u4ee5\u540e\uff0c\u4f1a\u91cd\u65b0\u4f30\u7b97expression\u7684\u503c\uff0c\u5047\u5982\u4f9d\u7136\u662f0\uff0c\u5219\u7ee7\u7eed\u6267\u884c\u4e0b\u4e00\u6b21\u7684\u5faa\u73aflinux\u547d\u4ee4\u89e3\u91ca\u5668\u6709\u54ea\u4e9b<\/strong>\uff0c\u76f4\u5230expression\u7684\u503c\u4e3a\u975e0\u3002<\/p>\n
\u7406\u89e3while\u53e5\u5b50\u4e0euntil\u53e5\u5b50\u7684\u533a\u522b<\/p>\n
\u8fd9\u4e24\u4e2a\u53e5\u5b50\u7684\u53e5\u578b\u7ed3\u6784\u5341\u5206\u76f8\u50cf\uff0c\u90fd\u662f\u5c06\u5faa\u73af\u6761\u4ef6\u7f6e\u4e8e\u53e5\u5b50\u7684\u65c1\u8fb9\u3002<\/p>\n
\u7136\u800c\uff0c\u5728while\u53e5\u5b50\u4e2d\uff0c\u5f53expression\u7684\u503c\u4e3a0\u65f6\u624d\u6267\u884c\u5faa\u73af\u4f53\u4e2d\u7684\u53e5\u5b50\uff0c\u5f53expression\u7684\u503c\u4e3a\u975e0\u503c\u65f6\uff0c\u5c06\u9000\u51fa\u5faa\u73af\u4f53\uff1b\u5728until\u53e5\u5b50\u4e2d\uff0c\u5f53expression\u7684\u503c\u4e3a\u975e0\u65f6\uff0c\u6267\u884c\u5faa\u73af\u4f53\u4e2d\u7684\u53e5\u5b50\uff0c\u5f53expression\u7684\u503c\u4e3a0\u65f6\uff0c\u5c06\u9000\u51fa\u5faa\u73af\u7ed3\u6784\u3002\u56e0\u800c\uff0c\u7528\u6237\u5728\u4f7f\u7528\u8fd9\u4e24\u79cd\u53e5\u5b50\u65f6\uff0c\u4e00\u5b9a\u8981\u6ce8\u610f\u5206\u8fa8\u8fd9\u4e2a\u5173\u952e\u7684\u5730\u65b9\u3002<\/p>\n
\u5728\u6267\u884c\u673a\u5236\u65b9\u9762\uff0c\u8fd9\u4e24\u4e2a\u53e5\u5b50\u662f\u76f8\u540c\u7684\uff0c\u5373\u9996\u5148\u4f1a\u5224\u5b9aexpression\u7684\u503c\uff0c\u5f53\u8be5\u8868\u8fbe\u5f0f\u7684\u503c\u7b26\u5408\u8981\u6c42\u65f6\uff0c\u624d\u6267\u884c\u5faa\u73af\u4f53\u4e2d\u7684\u53e5\u5b50\uff1b\u5426\u5219\uff0c\u90fd\u4e0d\u4f1a\u6267\u884c\u5faa\u73af\u4f53\u3002<\/p>\n
\u501f\u52a9break\u548ccontinue\u53e5\u5b50\u63a7\u5236\u5faa\u73af<\/p>\n
break\uff1a\u7acb\u523b\u4ece\u5faa\u73af\u4e2d\u9000\u51fa\uff1b<\/p>\n
continue\uff1a\u800c\u524d\u8005\u5219\u62ff\u6765\u8df3\u8fc7\u5faa\u73af\u4f53\u4e2d\u7684\u4e2a\u522b\u53e5\u5b50\uff0c\u7ee7\u7eed\u6267\u884c\u4e0b\u4e00\u6b21\u5faa\u73af\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
\u5982\u679c\u53d1\u73b0\u4e86\u6307\u5b9a\u7684\u89e3\u91ca\u5668\uff0c\u5219\u4f1a\u521b\u5efa\u4e00\u4e2a\u5173\u4e8e\u8be5\u89e3\u91ca\u5668\u7684\u8fdb\u7a0b\uff0c\u89e3\u91ca\u5e76\u6267\u884c\u5f53\u524d\u811a\u672c\u7684\u8bed\u53e5\u3002Shell\u811a\u672c\u7684\u8fd9\u4e2a\u89c4\u5b9a\u4f7f\u5f97\u7528\u6237\u53ef\u4ee5\u975e\u5e38\u7075\u6d3b\u5730\u8c03\u7528\u4efb\u4f55\u89e3\u91ca\u5668\uff0c\u800c\u4e0d\u4ec5\u4ec5\u9650\u4e8eShell\u7a0b\u5e8f\u3002\u4e0b\u9762\u4ecb\u7ecd\u5982\u4f55\u5728\u811a\u672c\u6587\u4ef6\u4e2d\u6307\u5b9a\u5176\u4ed6\u89e3\u91ca\u5668\u7a0b\u5e8f\u3002\u5728PHP\u811a\u672c\u6587\u4ef6\u4e2d\u6307\u5b9aPHP\u8bed\u8a00\u7684\u89e3\u91ca\u5668\uff0c\u7136\u540e\u6267\u884c\u6587\u4ef6\u4e2d\u7684PHP\u4ee3\u7801\uff0c\u4ee3\u7801\u5982\u4e0b\uff1a\u5728Shell\u8bed\u8a00\u4e2d\uff0c\u5168\u5c40\u53d8\u91cf\u53ef\u4ee5\u5728\u811a\u672c\u4e2d\u5b9a\u4e49\uff0c\u4e5f\u53ef\u4ee5\u5728\u67d0\u4e2a\u51fd\u6570\u4e2d\u5b9a\u4e49\u3002test\u547d\u4ee4\u7684\u8bed\u6cd5\u5982\u4e0b\uff1a<\/p>\n","protected":false},"author":1,"featured_media":15614,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[10],"tags":[93,259,793,118,665],"class_list":["post-15613","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-knowledge","tag-bl","tag-zf","tag-xh","tag-jb","tag-yj-3"],"_links":{"self":[{"href":"https:\/\/www.linuxcool.com\/wp-json\/wp\/v2\/posts\/15613","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.linuxcool.com\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.linuxcool.com\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.linuxcool.com\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.linuxcool.com\/wp-json\/wp\/v2\/comments?post=15613"}],"version-history":[{"count":0,"href":"https:\/\/www.linuxcool.com\/wp-json\/wp\/v2\/posts\/15613\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.linuxcool.com\/wp-json\/wp\/v2\/media\/15614"}],"wp:attachment":[{"href":"https:\/\/www.linuxcool.com\/wp-json\/wp\/v2\/media?parent=15613"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.linuxcool.com\/wp-json\/wp\/v2\/categories?post=15613"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.linuxcool.com\/wp-json\/wp\/v2\/tags?post=15613"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}