pbcopy -> c
pbpaste -> p
While it's nice to expect pbcopy on both OSX and Linux, it's better to
just alias c=pbcopy on OSX and assert on `c` and `p`, which are must
shorter to type.
Since I'm constantly editing vim, emacs, i3, zshrc, functions, aliases,
etc., I should support variables, aliases, and KBDs to make editing,
sourcing these files much more efficient.
