grep to show lines only after pattern

wannalearn · #1 (**permalink**) 06-12-2007

When i grep for a pattern the search results comes up with matching lines(some before the pattern and some after)...how can i limit the search so that it shows only the lines after the pattern specified

vino · #2 (**permalink**) 06-12-2007

Quote:

Originally Posted by wannalearn

When i grep for a pattern the search results comes up with matching lines(some before the pattern and some after)...how can i limit the search so that it shows only the lines after the pattern specified

You must have provided some extra flags for grep. Show us the grep command that you issued. GNU grep talks about

Code:

       -A NUM, --after-context=NUM
              Print NUM lines of trailing context after matching lines.  Places
              a line containing -- between contiguous groups of matches.
       -B NUM, --before-context=NUM
              Print NUM lines of leading context before matching lines.  Places
              a line containing -- between contiguous groups of matches.

Surely you must be have provided both the flags.

wannalearn · #3 (**permalink**) 06-12-2007

This wont help..
Print NUM lines of trailing context after matching lines..

Instead of lines I need pattern

Eg: Say i search for a pattern abc...the result i get is hdhd fhfhfh abc hdh jdhf

I want the result to be hdh jdhf

I went through the man page for grep and couldnt find any option which would help me accomplish the above result :-(

vino · #4 (**permalink**) 06-12-2007

You might want to look into the -E flag to see if it helps you. Off the top of my head, I can say, you could use sed.

Code:

sed -n -e "s/.*abc \(hdh jdhf\)/\1/p" input.txt

See if it helps. You might want to tweak things a bit.

wannalearn · #5 (**permalink**) 06-12-2007

-E doesnt help too...

I came around with a workaround using awk -F ! :-)

royalibrahim · #6 (**permalink**) 10-09-2007

Hi wannalearn, I need that "awk" script that you used to print 'n' no of lines below the matching pattern including that line also.

grep -A<n> "pattern" <file> --> will do the job, though I need an awk script for this. Please provide me.

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