For the hell of it, implementation of some unix design patterns inspired by ESR's text "the art of unix programming":

• Filter pattern - a tool that takes stuff in on stdin and spits it out on stdout

• Cantrip pattern - a tool that only returns a value, does not take params or talk to stdio at all

• Source pattern - a tool that just spits stuff out to stdout

• Sink pattern - a tool that reads stuff in from stdin and does stuff with it

• Sponge pattern - a tool that reads the whole of stdin and does stuff with it

• Compiler pattern - a tool that reads a file, does something with it, and spits out another file

• Ed pattern - a command-line tool similar to ed (or more modern: gdb and friends)

• Roguelike pattern - a full-screen CURSES program (like rogue, or vim, or whatever)

Partly boredom, and partly because these patterns are useful and so it makes sense to have some templates.

All the tools included are intentionally written to be as portable as possible and should compile cleanly just by running "make all", if they fail to compile please submit an issue.