* Greg Freemyer [06-26-14 12:43]:

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.

look at "grep -v" -- (paka)Patrick Shanahan Plainfield, Indiana, USA @ptilopteri http://en.opensuse.org openSUSE Community Member facebook/ptilopteri http://wahoo.no-ip.org Photo Album: http://wahoo.no-ip.org/gallery2 Registered Linux User #207535 @ http://linuxcounter.net -- To unsubscribe, e-mail: opensuse+unsubscribe@opensuse.org To contact the owner, e-mail: opensuse+owner@opensuse.org

On 06/26/2014 12:40 PM, 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?

It depends. You could try two variants. The first is "-v". What's not there. The second is look at the return/exit code for a FAILure to find any of the patterns. It depends on a few details about the search you haven't mentioned. Such as "many matches except for one' vs "none of the patterns". The other thing you can do is not use grep. My first thought is to use awk, but sometimes that has awk-ward sytax. My second though is that this is an excellent example for perl to show of, but that is predicted on you being familiar enough with perl. I was once but not now. http://www.theunixschool.com/2012/09/grep-vs-awk-examples-for-pattern-search... This is interesting but a bit lame in places. http://www.unix.com/shell-programming-and-scripting/183001-multiple-pattern-... It doesn't mention that you hashed indexed arrays to keep a count of which strings get matched. This looks close http://unix.stackexchange.com/questions/50491/the-simplest-method-to-count-l... -- /"\ \ / ASCII Ribbon Campaign X Against HTML Mail / \ -- To unsubscribe, e-mail: opensuse+unsubscribe@opensuse.org To contact the owner, e-mail: opensuse+owner@opensuse.org

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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