bash null conditional

[Craig White]

On Mon, 2009-03-30 at 19:57 +0100, Sharpe, Sam J wrote:
> 2009/3/30 Craig White <craigwhite at azapple.com>:
> > $ if [ -n $(grep A125 ARdebtorsmaster.csv) ]; then echo "null"; fi
> > null
> > $ if [ -n $(grep A121 ARdebtorsmaster.csv) ]; then echo "null"; fi
> > bash: [: too many arguments
> >
> > and then of course, light bulb goes off...I have to figure out how to
> > get a basic exit code from grep, but seemingly the -s and the -q aren't
> > the answer.
> 
> if [ `grep -c A125 ARdebtorsmaster.csv` -eq 0 ]; then echo "null"; fi
> if [ `grep -c A121 ARdebtorsmaster.csv` -neq 0 ]; then echo "notnull"; fi
> 
> -c returns the count of the number of matches.
----
thanks...I figured that out about 2 minutes before you sent the reply
(see my other e-mail).

Craig