Re: [Help-bash] test -v

[Jesse Molina]

Thanks.  My problem was that I was actually working on two hosts, one 
with bash 4.x and one with bash 3.x.  I was reading the man page on the 
bash 4 host and trying to write and run the script on the bash 3 host. 
Obvious confusion ensued.



Pierre Gaston wrote:
> On Sun, Jan 29, 2012 at 1:32 PM, Jesse Molina<address@hidden>  wrote:
> > Can someone cite an example of test -v which works?  It is supposed to test
> > if a variable has been defined, but I am confused.
> >
> > Normally I would [[ -z "$THINGY" ]] , but I thought I would give -v a shot.
> >   I get the feeling I should forget I ever tried.
>
> unset var; [[ -v var ]] || echo false
> var=;[[ -v var ]]&&  echo true
>
> -z test if the expansion is empty which is a bit different from set or unset

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