random-password-words

#!/bin/sh
set -euf

##
# Generate a good password of four random words from a text file.
#
# Usage:
#
#     random-password-with-words [file_path]
#
# Example:
#
#     $ random-password-with-words /usr/share/dict/passwords
#     foo bar goo baz
#
#
# Author: Joel Parker Henderson (joel@joelparkerhenderson.com)
# License: GPL
# Updated: 2015-01-25
##

password_file_path=${1-/usr/share/dict/passwords}
n=`echo '$=' | ed -s "$password_file_path"`

# Pick 4 random line numbers
random-seed
rand1=`random-int-faster $n`
rand2=`random-int-faster $n`
rand3=`random-int-faster $n`
rand4=`random-int-faster $n`

# Print the lines
file-line-num "$password_file_path" $rand1 $rand2 $rand3 $rand4 | sed ':a;N;$!ba;s/\n/ /g'