Add a version flag for every tool.
Example and more at: help2man
$ foo --version
GNU foo 1.1
Copyright (C) 2011 Free Software Foundation, Inc.
This is free software; see the source for copying conditions. There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
Written by A. Programmer.
Add a version flag for every tool. Example and more at: help2man
$ foo --version