nix/home/program/bash/module/Find.nix

{ ... }:
{
  text = ''
    # Find all file extensions.
    function find_ext() {
      local types=($(find -type f | sed -e "s/.*\///" -e "s/^\.//" -e "/\./!d" -e "s/.*\.//"))
      echo "''${types[@]}" | tr ' ' '\n' | sort -u
    }
  '';
}