Ruby Which
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gem install rwhich -v 0.0.1
Based on tenderlove's #which http://tenderlovemaking.com/2011/12/05/profiling-rails-startup-with-dtrace/ Base Use: > require 'rwhich/file' > File.which 'ls' => "/bin/ls" > File.which 'hahahahahah' #assuming you don't have a hahahahahah executable in ENV['PATH'] => nil Other Use: > require 'rwhich' > Class Foo extend RWhich end > Foo.which 'ls' => "/bin/ls" > Class Bar include RWhich end > bar = Bar.new > bar.which 'ls' => "/bin/ls"