Re: test -n "${var+set}"?

[Larry Jones]

Derek Robert Price writes:
>
> Got it now.  I read the bash man page as stating that this construct
> wouldn't echo "set" for a variable set to the empty string.

That's because the man page is talking about :+ rather than +:

        When not performing substring expansion, bash tests for a
        parameter that is unset or null; omitting the colon results in a
        test only for a parameter that is unset.

Viz.:

        $ var=
        $ echo ${var+set}
        set
        $ echo ${var:+set}

        $

-Larry Jones

Some people just don't have inquisitive minds. -- Calvin