$env:USERNAME 在 Get-ADuser 上过滤时未定义？

Question

Can anyone explain why this fails:

PS C:\Windows\system32> Get-ADUser -Filter {SamAccountName -eq $env:USERNAME}
Get-ADUser : Variable: 'env' found in expression: $env is not defined.

But this succeeds:

PS C:\Windows\system32> $u=$env:USERNAME

PS C:\Windows\system32> Get-ADUser -Filter {SamAccountName -eq $u}

DistinguishedName : CN<snip>

Is the above the most elegant workaround or am I missing something?

Answer 1

This works:

$username = $env:USERNAME
Get-ADUser -Filter 'SamAccountName -eq $username'

And this works too:

Get-ADUser -Filter "SamAccountName -eq '$($env:USERNAME)'"

Answer 2

You know, this works too:

Get-aduser "$samaccountname"

or

Get-aduser "$env:USERNAME"

Don't even need to bother with "-Filter" if you are passing the samaccountname