kind of dumb script to generate xkcd-style password

xkcd_password.sh

#!/bin/bash

# http://xkcd.com/936/
# http://namakajiri.net/misc/substantivos_pt.ascii

# TODO: getopt
# dict="/usr/share/dict/words"
# dict="/usr/share/dict/brazilian.utf8"
dict=/usr/local/share/dict/substantivos_pt.ascii

set -e
[ -r $dict ]
which shuf >/dev/null

function choose_word()
{
  while true; do
    choice=$(shuf -n 1 $dict)
    if ! echo $choice | grep -q "^[A-Z]"; then
      break
    fi
  done
  echo $choice
}

echo "$(choose_word)$(choose_word)$(choose_word)$(choose_word)"