View source for Returning Codes from PowerShell

PowerShell - the scripting language from Microsoft - often needs to be called from a command line. Often the calling program then needs to receive and inspect the exit code from the script to see if the PowerShell script completed OK.

==Example==

For instance, say we have the following code in a script called bad.ps1:
<pre>
## bad.ps1

## Something went wrong - let everyone know 
exit 7
</pre>

...and then we call this suffixed by "exit $LASTEXITCODE":
<pre>
rem bad.bat

rem Run our script
cmd.exe /c "powershell.exe  -ExecutionPolicy RemoteSigned C:\wherever\bad.ps1;exit $LASTEXITCODE"

rem Check if we can see the error
echo %ERRORLEVEL%
</pre>

And so we see the correct error level in the calling program (in our case the batch script):
<pre>
C:\>rem bad.bat

C:\>rem Run our script

C:\>cmd.exe /c "powershell.exe  -ExecutionPolicy RemoteSigned C:\wherever\bad.ps1;exit $LASTEXITCODE"

C:\>rem Check if we can see the error

C:\>echo 7
7
</pre>

==Further Reading==
[[Creating a Test Pack]]