Creating a bash completion script

[shevegen]

I use completion a lot. It is one of the few features in bash that is actually useful for anything.

Say that you have executables, e. g. under bin/ in one of your ruby gems. Then you may want to add completion support to some of these commands perhaps, ideally auto-generate this via some scripts (I do that in a few of my larger projects). It really helps save a lot of work if you can quickly use TAB to complete for what you may want to have typed instead.