bash-special-variables.sh

#!/bin/bash
echo script name: $0
echo first argument: $1
echo number of arguments passed:  $#
echo all the arguments are: $@
echo exit status of most recent process: $?
echo process id of the script: $$
echo username: $USER
echo hostname: $HOSTNAME
echo a random number: $RANDOM
echo current line number: $LINENO
echo sleeping for 5 seconds
sleep 5
echo total seconds to run this script: $SECONDS