Utilities to aid shell scripts or command-line users

Current version

Formula history

Zhiming Wang aardvark_shell_utils: fix test (#5191)
Mike McQuaid Use hash rockets again. (#5177)
Mike McQuaid Use Ruby 1.9+ symbol hash keys in all formulae. (#4942)
Baptiste Fontaine aardvark_shell_utils: add conflict with coreutils
Nikolaus Wittenstein Add descriptions to all remaining homebrew packages
Adam Vandenberg use test helpers
Mike Naberezny aardvark_shell_utils: add test