Here is a script that will randomly generate a hexadecimal digit. Please enjoy!
# randomhexdigit.sh - Version 0.01
#
# A simple Unix shell script that generates a random hexadecimal digit.
#
# Written by: Keith Rice
#
# This script is free to use but please credit me and/or link to my site.
# http://dkrcomputing.com
# You are free to modify this script to your heart's delight, but PLEASE
# DO NOT DISTRIBUTE MODIFIED VERSIONS! Please send comments and recommendationss
# for improvement to
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.
# Step 1: Get a random number using the $RANDOM environment variable
NUM=${RANDOM}
# Step 2: Perform modulo arithmetic using the 'let' shell command. Perform
# MOD 15 on the random number to get a number from 0 to 15.
let "NUM %= 15"
# Step 3: Convert our decimal number from step 2 into a hexadecimal digit
# by using the bc utility.
echo "obase=16;$NUM" | bc
# end of randomhexdigit.sh
