aaaAAAENVaaa bbbBBBENVbbb cccCCCEQLccc
xxx${ NOEXISTX }xxx yyyyyy zzzZZZEQLzzz
aaaAAAENVaaa bbbBBBENVbbb cccCCCEQLccc
xxx${ NOEXISTX }xxx yyyyyy zzzZZZEQLzzz
unset variable with default value: default
