Display lines around matching lines

[spookie]

Hi,
I want to extract lines following matching pattern in a file with the matching line.
grep, sed will obviously give me only matching line and not lines following them.
Example

This is line1 - user1
This is line2 - user2
This is line3 - user3

I want two lines follwing line which contain user1 and the matched line.

How it can be achieved?


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I never set a goal because u never know whats going to happen tommorow.

 

[Annihilannic]

One idea:

[tt]sed -n '/user1/{p;n;p;n;p;q;}'[/tt]

Annihilannic.

 

[olded]

check out this link:

http://www.tek-tips.com/viewthread.cfm?qid=1175911

 

[sbrews]

Found this nifty sccript in "An AIX Companion"
------cut here------
#!/bin/ksh
#***************************************************************************
#* Description *
#* ----------------------------------------------------------------------- *
#* Allows you to search a file and return the specified item plus the next *
#* X number of specified lines. *
#***************************************************************************
#***************************************************************************
# Check to see if there are at least 3 arguments
#***************************************************************************
if (( $# < 3 ))
then
echo "Usage: $0 pattern lines file [files]"
exit 1
fi

#***************************************************************************
# Create the internal variables
#***************************************************************************
STRING=$1
LINES=$2
shift 2 # $* now contains only file names

#***************************************************************************
# Build the awk script by reading lines from this script
#***************************************************************************
cat > a.script <<-!
BEGIN { output=0; }
/$STRING/ { output=$LINES; }
{ if (output > 0) { print; output=output-1; } }
!

#***************************************************************************
# Invoke the awk script and erase it when done.
#***************************************************************************
awk -f a.script $*
rm a.script
-----end cut------

save it as "mgrep" (or any name you want), make it executable and run it like this:

mgrep pattern 3 /some/file

If pattern is found, it will display line pattern is on and 2 lines after pattern.

 

[daFranze]

get gnu grep from sunfreeware.com

Best Regards, Franz
--
UNIX System Manager from Munich, Germany

 

[spookie]

Thanks for the info guys.

I will check that out.I have already checked Annihilannic solutions ( with little change i.e.sed -n '/user1/{p;n;p;n;p;q;}' <filename> ) and that works fine.


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I never set a goal because u never know whats going to happen tommorow.