ZSH

Autoload any ZSH function from $HOME/.zsh/functions.

  fpath=($HOME/.zsh/functions $fpath)
  autoload -U $HOME/.zsh/functions/*(:t)

Use rlwrap on some less-than-pleasant REPLs that don't have GNU Readline-like features themselves.

  alias csi="rlwrap csi"
  alias scsh="rlwrap scsh"