Script Template For Devs to Bash And Shell Scripts

#!/bin/bash
# Sample Script Template for Bash and Shell Script

trap finish 0
trap cleanup 1 2 3 6

function checksudocommand()
{
    if [ $(id -u) -ne 0 ];
    then
        echo -e "\nYou must run this script as root. You are able to use the sudo command.\n"
        exit 1
    fi
}

function cleanup()
{
    echo "Caught Signal ... cleaning up."
    echo "Done cleanup ... quitting."
    exit 1
}

function finish()
{
    # comment with code
    # script
    exit 0
}

function main()
{
    echo -e "\nHello, World!\n"
}

function usage()
{
    grep '^#/' "$0" | cut -c4-
    exit 0
}

expr "$*" : ".*--help" > /dev/null && usage

#### Main Program ####
checksudocommand
main