grep string & next n lines


 
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# 1  
Old 11-21-2005
grep string & next n lines

need help on this. let say i hv 1 file contains as below:

STRING
Description bla bla bla
Description yada yada yada
Data bla bla
Data yada yada


how do i want to display n lines after the string?

thanks in advance!
# 2  
Old 11-21-2005
You never mentioned your OS version

GNU grep has the following:

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.

       -C NUM, --context=NUM
              Print  NUM lines of output context.  Places a line containing --
              between contiguous groups of matches.

# 3  
Old 11-21-2005
thanks! it worked under GNU grep, but how about NON-GNU grep like in solaris?
# 4  
Old 11-21-2005
Don't know about non-GNU grep, but you could use sed instead, something like:-

sed -n '/STRING/,$p' filename|head -$n

(where $n is the number of lines you want after the match)
# 5  
Old 11-21-2005
I am not sure about grep. But sed would help.

Code:
sed -n -e '/pattern-matched/{N;N;p}' ashterix.txt

will print the matching line and 2 lines that follow it.

Vino
# 6  
Old 11-21-2005
it worked! thanks grasper & vino
# 7  
Old 11-21-2005
Quote:
Originally Posted by grasper
sed -n '/STRING/,$p' filename|head -$n

(where $n is the number of lines you want after the match)
Thats much more elegant !
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