CLI passphrase generator

chbs.sh

#!/usr/bin/env bash

#####
# Passphrase generator a la Diceware and XKCD
#
# Usage:
# chbs.sh [word count] [phrase count]
#
# https://gist.github.com/meznak/f230e36d7d8f8cbbf62a9a80a9eff0d7
# https://xkcd.com/936/
# https://theworld.com/~reinhold/diceware.html
#
# CC BY SA 2020 Nate Plamondon
#####

dict_file=~/eff_large_wordlist.txt
[[ -f $dict_file ]] || `wget https://www.eff.org/files/2016/07/18/eff_large_wordlist.txt -o dict_file`

dict_count=`wc -l ${dict_file} | cut -d\  -f5`
word_count=5
pass_count=5
pass=""

[[ $1 != "" ]] && word_count=$1
[[ $2 != "" ]] && pass_count=$2


n=0
while [[ $n -lt $pass_count ]]; do
  pass=""
  i=0
  while [[ $i -lt $word_count ]]; do
    rand=`od -vAn -N4 -tu4 < /dev/urandom`
    let "line = $rand % dict_count"
    word=`sed -n "${line}p" ${dict_file} | awk '{ print $2 }'`
    #echo "$line $word"
    pass+="${word} "
    let "i++"
  done
  let "length = ${#pass} - 1"
  echo "$length - $pass"
  let "n++"
done