Special variable $null in PowerShell introduction and creation of multiline annotation tips _powershell

This article introduces a very special variable in PowerShell, that is $null. The special thing about $null is that it never stores content.

While looking through a book of PowerShell, I found a description of the $null variable, which was very interesting and a close-up to share with you.

Take a look at this example:

Copy Code code as follows:

PS c:\users\zhanghong> $null =1122
PS c:\users\zhanghong> $null
PS c:\users\zhanghong>

Do you understand? The small series assigns a value of "1122" to the $null variable, but when I output it immediately, I find that it has no content.

If we use $null with here string (just @), we can get multiple lines of comment. and see the effect:

Copy Code code as follows:

#正常注释
$null =@ "
Comment Content Line 1
Comment Content Line 2
Comment Content Line 3
@"
#正常注释

We can realize the magical $null variable.

OK, about PowerShell special variable $null, Hongo introduced so, hope to help everyone.