Debugging stuff

debug.sh

set -e

prev_cmd=""
this_cmd=""
prev_line=""
this_line=""
debug_trap() {
    prev_cmd="${this_cmd}"
    this_cmd="${BASH_COMMAND}"
    prev_line="${this_line}"
    this_line="${BASH_LINENO[0]}"
}
trap 'debug_trap' DEBUG

report_errors() {
  ec=$?
  if [ ${ec} -ne 0 ]; then
    echo ${BASH_SOURCE[0]}:${prev_line} ${prev_cmd} >&2
  fi
}

trap 'report_errors' EXIT

echo do some stuff
false