Re: [opensuse] grep - how to tell which patterns are NOT in the searched file

Greg Freemyer wrote:

All,

I know "grep -F -f pattern_file <files-to-search>

will give me a list of all lines with a pattern in them.

I want to know which of the patterns had no matches.

I tried "grep -F --count -f pattern_file <files-to-search>" but it gives a cumulative count for all patterns

I want a count per pattern so I can find the patterns with 0 count.

Do I have to write a bash loop and call grep once for each pattern?

Yes, but to save execution time, count matches on the results, not the files to search: grep -F -f pattern_file <files-to-search> > $FOUND for PATTERN in `cat pattern_file` do COUNT=`grep -F $PATTERN -c` case $COUNT in 0 ) echo *** NO MATCHES: $PATTERN ;; * ) echo $COUNT:^I $PATTERN ;; esac done

Thanks Greg -- Greg Freemyer

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