Calling a specific PowerShell function from the command line
PowershellPowershell Problem Overview
I have a PowerShell script that contains several functions. How do I invoke a specific function from the command line?
This doesn't work:
powershell -File script.ps1 -Command My-Func
Powershell Solutions
Solution 1 - Powershell
You would typically "dot" the script into scope (global, another script, within a scriptblock). Dotting a script will both load and execute the script within that scope without creating a new, nested scope. With functions, this has the benefit that they stick around after the script has executed. You could do what Tomer suggests except that you would need to dot the script e.g.:
powershell -command "& { . <path>\script1.ps1; My-Func }"
If you just want to execute the function from your current PowerShell session then do this:
. .\script.ps1
My-Func
Just be aware that any script not in a function will be executed and any script variables will become global variables.
Solution 2 - Powershell
The instruction throws the error message below. The dot is needed before the name of the file name to load it into memory, as Keith Hill suggested.
MyFunction: The term 'MyFunction' is not recognized as the name of a cmdlet, function, script file, or operable program. Check the spelling of the name, or if a path was included, verify that the path is correct and try again.
Solution 3 - Powershell
This solution works with powershell core:
powershell -command "& { . .\validate.ps1; Validate-Parameters }"
Solution 4 - Powershell
Perhaps something like
powershell -command "& { script1.ps; My-Func }"
Solution 5 - Powershell
If it's a .psm1 file (as opposed to .ps1) then call this instead:
powershell -command "& { Import-Module <path>\script1.psm1; My-Func }"