Generate a 4-6 word passphrase similar to https://xkcd.com/936/

generatePassphrase.sh

#!/bin/bash

WORDLIST=$(grep -iv '[^abcdefghijklmnopqrstuvwxyz]' /usr/share/dict/words)
COUNT="$(echo "($RANDOM%3)+4"|bc)"
WORDCOUNT="$(echo "$WORDLIST"|wc -l)"


LC_CTYPE=C
x=0
while [ $x -lt $COUNT ]; do
        echo -n $(echo "$WORDLIST"|tail -n$(echo "($RANDOM % $WORDCOUNT)+1"|bc)|head -n1|sed -e 's/\b\(.\)/\u\1/')
        x=$(echo "$x + 1"|bc)
done

echo