Bash Shell Generate Random Numbers

Bash Shell Generate Random Numbers
http://www.cyberciti.biz/faq/bash-shell-script-generating-random-numbers/

0-32767(0x7fff)
# echo $RANDOM
9896
# od -vAn -N4 -tu4 < /dev/urandom
2403096920
# od -vAn -N2 -tu2 < /dev/urandom
10369