PowerShell outputs information via different streams. Warnings are written to a different stream than output, and errors again go to a different stream. Each stream has a unique numeric identifier:
| ID | Stream |
| 1 | Output |
| 2 | Error |
| 3 | Warning |
| 4 | Verbose |
| 5 | Debug |
| 6 | Information |
If you want to silence a stream, you can use the redirection operator (“>”) and redirect the stream(s) to $null. This line would discard any error or warning messages:
Get-Process -FileVersionInfo 2>$null 3>$null
