Log trapper, useful when you want to log all commands with a timestamp for further analysis (e.g. if your script echoes to a log file)

logtrap.sh

#!/bin/bash

function logtrap() {
	local last="${BASH_COMMAND}"
	local exitcode=${?}

	# any format is ok but this will be printed BEFORE all commands, not after
	echo "TRAPLOG: [$(date +%T)] [${exitcode}] [${last}]"
}

trap logtrap DEBUG

echo "testing"

false 12345

true 09876

ls -l /tmp | head

uname -a

exit 0