Question

I’m using PowerShell scripts for some UI automation of a WPF application. Normally, the scripts are run as a group, based on the value of a global variable. It’s a little inconvenient to set this variable manually for the times when I want to run just one script, so I’m looking for a way to modify them to check for this variable and set it if not found.

test-path variable:\foo doesn’t seem to work, since I still get the following error:

The variable ‘$global:foo’ cannot be retrieved because it has not been set.

Answer 1

EDIT: Use stej’s answer below. My own (partially incorrect) one is still reproduced here for reference:

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You can use

Get-Variable foo -Scope Global

and trap the error that is raised when the variable doesn’t exist.