All PowerShell versions
Some variables are protected and cannot be changed. To identify these, take a look at this line:
Get-Variable | Where-Object { $_.Options -like '*Constant*' -or $_.Options -like '*ReadOnly*' } | Select-Object -Property Name, Options, Description
The result looks similar to this:
Name Options Description ---- ------- ----------- ? ReadOnly, AllScope Status des letzten Befehls ConsoleFileName ReadOnly, AllScope Name der aktuellen Kons... Error Constant ExecutionContext Constant, AllScope Die für Cmdlets verfügb... false Constant, AllScope Boolean False HOME ReadOnly, AllScope Ordner mit dem Profil d... Host Constant, AllScope Ein Verweis auf den Hos... PID Constant, AllScope Aktuelle Prozess-ID PSCulture ReadOnly, AllScope Die Kultur der aktuelle... PSHOME Constant, AllScope Der übergeordnete Ordne... psISE Constant PSUICulture ReadOnly, AllScope Die Benutzeroberflächen... psUnsupportedConsoleAppl... Constant PSVersionTable Constant, AllScope Versionsinformationen f... ShellId Constant, AllScope "ShellID" gibt die aktu... true Constant, AllScope Boolean True
The interesting part is how Where-Object identified the variables. The code used a string comparison and –like. That’s because the variable options are flags, and flags can be combined. By using –like and placeholders, you can (halfway) safely identify the flag you are after, even if additional flags have been set.
