Function wrapper for trap in Bash. It works almost like "defer" in Golang, allowing you to append multiple functions that will be called on a specific event.

bash_trap.sh

function set_trap(){
  local function_name="${1}"
  local signal_name="${2}"

  local current_trap
  local current_code

  [[ -z "${function_name}" || -z "${signal_name}" ]] && return 1

  current_trap=$(trap -p "${signal_name}")
  if [[ -z "${current_trap}" ]];then
    eval "trap '${function_name}' ${signal_name}"
    return 0
  fi

  current_code=$(echo "${current_trap}" \
    |sed -E "s/trap -- (['\"]?)(.+)\1 ${signal_name}/\2/")
      eval "trap -- '${function_name};${current_code}' ${signal_name}"

  return 0
}

Usage example:

RULES_GET_DST="$(mktemp)"
set_trap "rm -f ${RULES_GET_DST}" EXIT

TMP_FILE="$(mktemp)"
set_trap "rm -f ${TMP_FILE}" EXIT

You can stack code that will be executed on a certain signal.