#!/bin/sh set -ex unset USR # this should succeed and return 'nobody' as var is undefined ansible -m debug -a msg="{{ lookup('env', 'USR', default='nobody')}}" localhost |grep nobody # var is defined but empty, so should return empty USR='' ansible -m debug -a msg="{{ lookup('env', 'USR', default='nobody')}}" localhost |grep -v nobody # this should fail with undefined ansible -m debug -a msg="{{ lookup('env', 'USR', default=Undefined)}}" localhost && exit 1 || exit 0