PSMDTAG:FAQ: What is the difference between single quoted and double quoted strings? ANSWER: Double quoted string expand variables and single quoted strings do not.<\/p>\n
Example:<\/p>\n
PS> <\/font>$x=”TEST” <\/p>\n PSMDTAG:FAQ: How do variables expand in strings?<\/p>\n PSMDTAG:FAQ: Why don’t properties work with variable expansion in strings?<\/p>\n Variables get expanded in strings not property expressions. Here is an example of a property expression that you might like to use that doesn’t work the way you might think it would:<\/p>\n PS> Calc In this example, $c gets expanded to “System.Diagnostics.Process (calc)”. The problem is that you wanted the $c.Handles to be expanded. <\/p>\n <\/p>\n <\/p>\n PSMDTAG:FAQ: How do I expand an expression in a string?<\/p>\n Windows PowerShell will expand a variable or an expression in a string. Thus to get $c.Handles expanded you do the following:<\/p>\n PS> “Calc uses $($c.Handles)<\/font> Handles” Now from here, it gets even better. You can put anything put any code you want into that expression. You can put a 40 page script in there if you want. Here is an example:<\/p>\n PS> cat t.ps1 PS> .\\t.ps1<\/strong><\/font> <\/p>\n So by using $(), you can do almost anything you could want to do. <\/p>\n “ALMOST ?!!!??”<\/em><\/p>\n<\/blockquote>\n Yeah – almost but not really everything. Notice that I used single quotes for the format string in the expression: ‘`n`t{0}’ . The reason I did that is that if I used double quotes, it would have caused a parser error. I could have used escape characters but that wouldn’t help me make the point I’m making so … <\/p>\n <\/p>\n <\/p>\n PSMDTAG:FAQ: How do I show double quotes within a double quoted string? ANSWER: escape them with a backtick `” or use Here-Strings.<\/p>\n A Here-String is a string which starts with a @” and ends with a “@ (on a line by itself). Here-Strings can use any character you want until it sees a “@ which terminates the string. <\/p>\n PS> cat t.ps1 Here strings are an AWESOME tool for creating HTML or XML documents. <\/p>\n Have a blast!<\/p>\n Jeffrey Snover [MSFT] <\/p>\n","protected":false},"excerpt":{"rendered":" PSMDTAG:FAQ: What is the difference between single quoted and double quoted strings? ANSWER: Double quoted string expand variables and single quoted strings do not. Example: PS> $x=”TEST”PS> “This is a $x”This is a TESTPS> ‘This is a $x’This is a $x PSMDTAG:FAQ: How do variables expand in strings? PSMDTAG:FAQ: Why don’t properties work with […]<\/p>\n","protected":false},"author":600,"featured_media":13641,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[1],"tags":[10],"class_list":["post-9991","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-powershell","tag-faq"],"acf":[],"blog_post_summary":" PSMDTAG:FAQ: What is the difference between single quoted and double quoted strings? ANSWER: Double quoted string expand variables and single quoted strings do not. Example: PS> $x=”TEST”PS> “This is a $x”This is a TESTPS> ‘This is a $x’This is a $x PSMDTAG:FAQ: How do variables expand in strings? PSMDTAG:FAQ: Why don’t properties work with […]<\/p>\n","_links":{"self":[{"href":"https:\/\/devblogs.microsoft.com\/powershell\/wp-json\/wp\/v2\/posts\/9991","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/devblogs.microsoft.com\/powershell\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/devblogs.microsoft.com\/powershell\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/devblogs.microsoft.com\/powershell\/wp-json\/wp\/v2\/users\/600"}],"replies":[{"embeddable":true,"href":"https:\/\/devblogs.microsoft.com\/powershell\/wp-json\/wp\/v2\/comments?post=9991"}],"version-history":[{"count":0,"href":"https:\/\/devblogs.microsoft.com\/powershell\/wp-json\/wp\/v2\/posts\/9991\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/devblogs.microsoft.com\/powershell\/wp-json\/wp\/v2\/media\/13641"}],"wp:attachment":[{"href":"https:\/\/devblogs.microsoft.com\/powershell\/wp-json\/wp\/v2\/media?parent=9991"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/devblogs.microsoft.com\/powershell\/wp-json\/wp\/v2\/categories?post=9991"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/devblogs.microsoft.com\/powershell\/wp-json\/wp\/v2\/tags?post=9991"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}
<\/strong>PS> <\/font><\/font>“This is a $x”
<\/strong>This is a TEST
PS> <\/font><\/font>‘This is a $x’
<\/strong>This is a $x<\/font><\/font><\/p>\n
PS> $c = Get-Process Calc
PS> “Calc uses $c<\/font>.Handles Handles”
Calc uses System.Diagnostics.Process (calc)<\/font>.Handles Handles<\/font><\/p>\n
Variables look like: $variable
Expressions look like: $(expression)<\/p>\n
Calc uses 42<\/font> Handles<\/font><\/p>\n
<\/strong>“
Cmds with > 800 handles are: $(
$limit = 800
$procs = Get-Process |where {$_.handles -ge $limit}
foreach ($p in $procs)
{ ‘`n`t{0}’ -f $p.Name.ToUpper()
}
)
<\/font>“<\/p>\n
Cmds with > 800 handles are:
CCMEXEC
CSRSS
IEXPLORE
IEXPLORE
LSASS
OUTLOOK
POWERSHELL
PS
SEARCHINDEXER
SVCHOST
SYSTEM
WINLOGON
<\/font><\/p>\n\n
<\/strong>@”
<\/font>“Cmds”<\/font> with > 800 handles are: $(
$limit = 800
$procs = Get-Process |where {$_.handles -ge $limit}
foreach ($p in $procs)
{ “`n`t{0}”<\/font> -f $p.Name.ToUpper()
}
)
Jeffrey likes to say, “I LOVE HERE-STRINGS”
<\/font><\/font>“@
<\/font>
PS> .\\t.ps1
“Cmds”<\/font> with > 800 handles are:
CCMEXEC
CSRSS
IEXPLORE
IEXPLORE
LSASS
OUTLOOK
POWERSHELL
PS
SEARCHINDEXER
SVCHOST
SYSTEM
WINLOGON
Jeffrey likes to say, “I LOVE HERE-STRINGS”<\/font><\/font><\/p>\n
Windows PowerShell\/Aspen Architect
Visit the Windows PowerShell Team blog at: http:\/\/blogs.msdn.com\/PowerShell<\/a>
Visit the Windows PowerShell ScriptCenter at: http:\/\/www.microsoft.com\/technet\/scriptcenter\/hubs\/msh.mspx<\/a><\/p>\n