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Locate the specified program file.

# Which.ps1,  Version 1.00
# Locate the specified program file
# Port of Unix' WHICH command
#
# Usage:  WHICH.PS1  filename[.ext]
#
# Where:  "filename" is a file name only: no drive or path
#
# Written by Rob van der Woude
# http://www.robvanderwoude.com

param([string] $file=$(throw "Please specify a filename."))
(get-command $file).Definition