Template for shell scripts with proper error catching

good_practice

#!/bin/sh

# Template for shell scripts with proper error catching
# Modified from http://www.alittlemadness.com/2012/06/25/bash-tip-reliable-clean-up-with-trap/

# immediately fail on error anywhere
set -e

# Defines a working area on the file system.
TEMP_DIR=/tmp/$$.scratch
 
function cleanUp() {
    if [[ -d "${TEMP_DIR}" ]]
    then
        rm -r "${TEMP_DIR}"
    fi
}

trap cleanUp EXIT

mkdir "${TEMP_DIR}"

# Do things below, placing temp files in $TEMP_DIR


# We succeeded, reset trap and clean up normally.
trap - EXIT

cleanUp