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Firstly in method 1, thesed<\/code>command takes the output through the pipe operator. In the sed<\/strong> command \\(.*\\)<\/code> captures the string and the\\L<\/code>converts the strings\u2019 characters to lowercase. Later in method 2, the script uses's\/.*\/\\L&\/g'<\/code>which also converts the characters to lowercase. It uses-g<\/code>flag which globally replaces all the characters in the output.<\/div><\/div>\n![\"Using](\"https:\/\/linuxsimply.com\/wp-content\/uploads\/2024\/02\/7.-Using-sed.png\")
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From the output, you can see the inputs\u2019 uppercase characters have converted to lowercase.<\/p>\n
<\/span>Convert a Specific Character<\/span><\/h4>\nTo convert a specific character to lowercase using the sed command, take a look at the following script:<\/p>\n
#!\/bin\/bash\n\nMain_string="Hello World"\nNew_string=$(echo "$Main_string" | sed -e 's\/H\/h\/g' -e 's\/W\/w\/g')\n\necho "Main_string:" $Main_string\necho "Modified_string:" $New_string<\/code><\/pre>\nEXPLANATION<\/div>
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In the $(echo "$Main_string" | sed -e 's\/H\/h\/g' -e 's\/W\/w\/g')<\/code>, the pipe operator takes the output of theecho<\/code>command and pipes it as input to the sed command<\/strong>. Thesed<\/code> command replaces the characterH<\/code>withh<\/code>andW<\/code>withw<\/code>globally. At last, the bash script stores the modified string in the New_string variable.<\/div><\/div>\n![\"Convert](\"https:\/\/linuxsimply.com\/wp-content\/uploads\/2024\/02\/8.-Replacechar.png\")
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The output shows that the script replaces the first character of the words from upper case to lower case.<\/p>\n
<\/span>6. Using \u201cPerl\u201d Command<\/span><\/h3>\nIn bash scripting, the Perl command<\/strong> provides a simple way to convert strings to lowercase. The Perl command reads each line of the input then uses the lc function to convert the input to lowercase and later it displays the modified output. To convert a string to lowercase using the Perl command, check the following script:<\/p>\n#!\/bin\/bash\n\ninput_string="Bash Lowercase with Perl"\n\necho "$input_string" | perl -ne 'print lc'<\/code><\/pre>\nEXPLANATION<\/div>
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In theperl -ne<\/code>command, the-n<\/code>option makes the perl command<\/strong> process the input line by line and the -<\/code>option executes the perl command in the terminal. Later, the