popt

Getopt(3) like library with a number of enhancements, from Redhat

This is the popt command line option parsing library. While it is similar to getopt(3), it contains a number of enhancements, including: 1) popt is fully reentrant 2) popt can parse arbitrary argv[] style arrays while getopt(2) makes this quite difficult 3) popt allows users to alias command line arguments 4) popt provides convenience functions for parsing strings into argv[] style arrays