Re: bash null conditional

["Sharpe, Sam J" <sam sharpe+lists redhat gmail com>]

2009/3/30 Craig White <craigwhite 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.

-- 
Sam