find string, then get the next 3 lines in a file Post: 302144136

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Top Forums Shell Programming and Scripting find string, then get the next 3 lines in a file Post 302144136 by drl on Tuesday 6th of November 2007 11:08:08 AM

11-06-2007

Registered User

Hi.

The GNU grep can easily do this. However, AT&T offers cgrep which also can do "context" printing. One might want to use this approach for files that are large enough so that shell scripts might be too slow, or where you need additional features:

Code:

#!/bin/bash --posix

# @(#) s1       Demonstrate AT&T free cgrep for grep with context.

set -o nounset
echo

debug=":"
debug="echo"

## Use local command version for the commands in this demonstration.

echo "(Versions displayed with local utility \"version\")"
version >/dev/null 2>&1 && version bash cgrep
set -o posix
set -o | grep -i posix

echo

FILE=${1-data1}

cgrep +3 "dining" $FILE

exit 0

Producing on your data in file "data1":

Code:

% ./s1

(Versions displayed with local utility "version")
GNU bash 2.05b.0
cgrep (local) - no version provided.
posix           on

acct dining mem
open 0 50
dep 50 0
close 255 0

The AT&T source for cgrep is available at: cgrep home page -- I had no trouble downloading and compiling it on GNU/Linux, but I cannot vouch for HPUX.

It is a very useful command that can take on jobs that GNU grep normally does, plus a lot more. Best wishes ... cheers, drl

drl

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LEARN ABOUT PHP

zgrep

ZGREP(1)						      General Commands Manual							  ZGREP(1)

NAME

       zgrep - search possibly compressed files for a regular expression

SYNOPSIS

       zgrep [ grep_options ] [ -e ] pattern filename...

DESCRIPTION

       Zgrep  invokes  grep  on  compressed  or  gzipped  files.   These  grep	options  will  cause  zgrep  to  terminate  with  an  error  code:
       (-[drRzZ]|--di*|--exc*|--inc*|--rec*|--nu*).  All other options specified are passed directly to grep.  If no file is specified,  then  the
       standard input is decompressed if necessary and fed to grep.  Otherwise the given files are uncompressed if necessary and fed to grep.

       If the GREP environment variable is set, zgrep uses it as the grep program to be invoked.

EXIT CODE

       2 - An option that is not supported was specified.

AUTHOR

       Charles Levert (charles@comm.polymtl.ca)

SEE ALSO

       grep(1), gzexe(1), gzip(1), zdiff(1), zforce(1), zmore(1), znew(1)

																	  ZGREP(1)

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