Mastering Windows PowerShell Scripting - Third Edition

Redirection to a file

Output from a specific stream may be directed by placing the stream number on the left of the redirect operator.

For example, the output written by Write-Warning can be directed to a file:

PS> function Test-Redirect{>>     'This is standard out'>>     Write-Warning 'This is a warning'>> }PS> $stdOut = Test-Redirect 3> 'warnings.txt'PS> Get-Content 'warnings.txt'This is a warning

When using the redirect operator, any file of the same name is overwritten. If information must be added to a file, the operator becomes >>:

$i = 1 
function Test-Redirect{ 
    Write-Warning "Warning $i" 
} 
Test-Redirect 3> 'warnings.txt'   # Overwrite 
$i++ 
Test-Redirect 3>> 'warnings.txt'  # Append 

It is possible to redirect additional streams, for example, ...