safe-bash.sh

#!/bin/bash

set -euo pipefail

error() {
  local parent_lineno="$1"
  local message="$2"
  local code="${3:-1}"
  if [[ -n "$message" ]] ; then
    echo "Error on or near line ${parent_lineno}: ${message}; exiting with status ${code}"
  else
    echo "Error on or near line ${parent_lineno}; exiting with status ${code}"
  fi

  touch FAILED

  exit "${code}"
}
trap 'error ${LINENO}' ERR

echo hi
eco woot
echo wat
touch SUCCEEDED