How to use robocopy mirror without output?
I am trying to delete a folder using robocopy mirroring like this:
Start-Process -FilePath "robocopy.exe" -ArgumentList "$emptyDir $sourcePath /mir /e /np /ns /nc /njs /njh /nfl /ndl" -Wait -PassThru -NoNewWindow but still get a line of output for every deleted file 
I tried adding >nul 2>&1 as explained in another answer here Start-Process -FilePath "robocopy.exe" -ArgumentList "$emptyDir $sourcePath /mir /e /np /ns /nc /njs /njh /nfl /ndl >nul 2>&1" -Wait -PassThru -NoNewWindow but still get the same output.
Since you're running robocopy in the current console window (-NoNewWindow), synchronously (-Wait), there is no reason to use Start-Process at all - just invoke robocopy directly, which also allows you to use > redirections effectively:
robocopy.exe $emptyDir $sourcePath /mir /e /np /ns /nc /njs /njh /nfl /ndl *>$null
Note:
Direct execution makes a program's stdout and stderr output directly available to PowerShell, via its success and error output streams.
*>$nullis a convenient PowerShell shortcut for silencing all output streams - see about_Redirection.Another benefit of direct invocation is that the external program's process exit code is reported in PowerShell's automatic
$LASTEXITCODEvariable.
See also:
- This answer provides background information.
- GitHub docs issue #6239 provides guidance on when use of
Start-Processis and isn't appropriate.
As for what you tried:
You fundamentally cannot suppress output from a process launched with
Start-Process -NoNewWindowon the PowerShell side.Trying to silence command output at the source, i.e. as part of the target process' command line with
>nul 2>&1, would only work ifcmd.exewere the-FilePathargument and you passed arobocopycommand to it.>redirections are a shell feature, androbocopyitself isn't a shell.
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