CODEWITHSUNDEEP
powershell
justin0
justin0

Reputation: 181

Redirect cmdlet warning/error output?

This must be a very simple solution, but I can't for the life of me figure out how to redirect errors/warnings to standard output.

Right now, I'm capturing the output of stuff by assigning it to a variable, without worrying about formatting etc, so for example:

$buffer += Whatever-Cmdlet

But what I would like to do is also capture any error message into that variable. Like doing 2>&1.

Is there any way to make this work? I did try: 

$buffer += Whatever-Cmdlet 2>&1

without success.

Thanks for any assistance!

Upvotes: 2

Views: 4251

Answers (3)

Ansgar Wiechers
Ansgar Wiechers

Reputation: 200503

It depends on which version of PowerShell you're running. In PowerShell v2 warnings are written to the host and thus cannot be captured in a variable. In PowerShell v3 warnings are written to a separate output stream, so you have to redirect the warning stream as well as the error stream to capture errors and warnings:

$buffer += Whatever-Cmdlet 2>&1 3>&1 | Out-String

See Get-Help about_Redirection for more information.

Upvotes: 0

mjolinor
mjolinor

Reputation: 68341

Not tested thoroughly, but

$buffer += Whatever-Cmdlet -WarningVariable +buffer -ErrorVariable +buffer

if you have v3/4:

$PSDefaultParameterValues=@{"*:WarningVariable"="+buffer";"*:ErrorVariable"="+buffer";}

Should do it for all the cmdlets your run after you set that.

Upvotes: 2

justin0
justin0

Reputation: 181

Actually, it turns out as long as you pipe the output: 

$buffer += Whatever-Cmdlet 2>&1 | Out-String

It seems to work. Thanks!

Upvotes: 1

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