Shell: Get a return code (exit code) from a command on set -e

run_and_get_rc.sh

#!/bin/sh

run_and_get_rc() {
  local _rc_vname="$1"; shift
  local _rc
  local _shopts="$-"

  if [ "${_rc_vname#*[!a-z_]}" != "$_rc_vname" ]; then
    echo "run_and_get_rc: Invaid return variable name: $_rc_vname" 1>&2
    exit 1
  fi

  set +e
  "$@"
  _rc="$?"
  eval "$_rc_vname=$_rc"

  if [ "${_shopts#*e}" != "$_shopts" ]; then
    set -e
    return 0
  fi

  return "$_rc"
}

set -e

run_and_get_rc rc ls --invalid-option-xxx
echo $?
echo "$rc"

simple.sh

#!/bin/sh
##
## https://twitter.com/eban/status/1470957323753779201

set -e
ls --invalid-option-xxx && true
echo $?