I have a set of PowerShell scripts that include a \"common\" script, located in the same folder, like this:
# some-script.ps1
$scriptDir = Split-Path -Parent
I don't believe you can, from within the invoked script. From get-help invoke-command:
-FilePath Runs the specified local script on one or more remote computers. Enter the path and file name of the script, or pipe a script path to Invoke-Command. The script must reside on the local computer or in a directory that the local computer can access. Use the ArgumentList parameter to specify the values of parameters in the script.
**When you use this parameter, Windows PowerShell converts the contents of the specified script file to a script
block, transmits the script block to the remote computer, and runs it on the remote computer.**
When you use invoke-command using the -filepath parameter, the script is read from the file on the local computer, converted to a script block, and that's what gets passed to the remote computer. The remote computer doesn't have any way of knowing if that script block was read from a file.
For the remote computer to know what that original file path was, you'll have to tell it. I think the easiest way to do that would be to write a function to do the invocation, and have it pass the filename to the invoked script as a parameter.