In PowerShell, how do I test whether or not a specific variable exists in global scope?

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 littl

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.