bash null conditional

[Craig White]

On Mon, 2009-03-30 at 11:33 -0700, Agile Aspect wrote:
> Craig White wrote:
> > I'm in my bash book and looking on web but can't seem to resolve this
> > simple problem.
> >
> > $ if [ -n "grep A121 myfile.csv" ]; then echo "null"; fi
> > null
> >
> > $ if [ -n "grep A125 myfile.csv" ]; then echo "null"; fi
> > null
> >
> > A125 definitely is null when I just run the grep command in the quotes
> > but A121 definitely is not null.
> >
> > What am I missing on the if/null operator here?
> >
> > Craig
> >
> >   
> I believe it's
> 
>     if [ -z "grep A121 myfile.csv" ]; then echo "null"; fi
----
not working for me...

$ if [ -z "grep A121 ARdebtorsmaster.csv" ]; then echo "null"; fi
$ if [ -z "grep A125 ARdebtorsmaster.csv" ]; then echo "null"; fi
$

Craig