Paste this to the top of your BASH scripts for a much nicer BASH coding experience

My BASH header for every script.bash

#!/usr/bin/env bash
readonly DIR=$(dirname $(readlink -f "$0"))
cd $DIR;
set -e
set -u
set -o pipefail
standardIFS="$IFS"
IFS=$'\n\t'
echo "
===========================================
$(hostname) $0 $@
===========================================
"
# Error Handling
backTraceExit () {
    local err=$?
    set +o xtrace
    local code="${1:-1}"
    printf "\n\nError in ${BASH_SOURCE[1]}:${BASH_LINENO[0]}. '${BASH_COMMAND}'\n\n exited with status: \n\n$err\n\n"
    # Print out the stack trace described by $function_stack
    if [ ${#FUNCNAME[@]} -gt 2 ]
    then
        echo "Call tree:"
        for ((i=1;i<${#FUNCNAME[@]}-1;i++))
        do
            echo " $i: ${BASH_SOURCE[$i+1]}:${BASH_LINENO[$i]} ${FUNCNAME[$i]}(...)"
        done
    fi
    echo "Exiting with status ${code}"
    exit "${code}"
}
trap 'backTraceExit' ERR
set -o errtrace
# Error Handling Ends