With PowerShell 2.0 came multi-line comments. They start with "<#" and end with "#>". They can be placed anywhere (except inside strings, but that's sort of a given), and anything between them will be treated as a comment. PowerShell 2.0 comes built-in with Windows 7 and Server 2008 R2. In Windows 10, you have Windows PowerShell 5.1 and optionally PowerShell Core.
A screenshot with syntax highlighting in the PowerShell ISE editor is handy to demonstrate (text versions below). This is as it appears in powershell_ise.exe (executable location link) with default syntax highlighting:
$Computers = Get-ADComputer -Filter * <# This is the start of the comment. This is some stuff in the middle. and this is the end #>$Computers | ForEach-Object {$_.Name}
<# I like using them like this, where they're the only thing on the line. #> 'Done'
To get a multi-line comment in PowerShell version 1, you can "hackishly" use so-called "here strings" to "comment out" multiple lines / a block of code. You do this simply by enclosing the code snippet in either "@' contents '@" or "@" contents "@", where the latter will interpolate/expand/substitute variables. Then you pipe it to Out-Null to suppress output. See the examples below.
Be aware that you need to put the closing delimiter ('@ or "@) on its own line and at the start of the line. Also be aware that the safest choice is single quotes.
@' the code to comment out, possibly containing 's and "s goes here. Variables will NOT be expanded/interpolated in a single-quoted here string. '@ | Out-Null
... or
@" the code to comment out, possibly containing 's and "s goes here. Variables will be expanded/interpolated in a double-quoted here string. "@ | Out-Null
Single-line comments start with a hash sign: "'''#'''". They can be placed almost anywhere (of course not inside strings) and will make the rest of the line a comment.
$LogFiles = dir c:\windows -filter '*.log' # This function does cool stuff Some-Function $with $arguments # and another comment here ### This is another single-line comment # and another
Keywords: comment out, add comment, comment that spans multiple lines, comment out a block, block comment powershell version 1, v1, v2, powershell core windows powershell,
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