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Full Discussion: Get 20 lines above string found, and 35 below string
Top Forums Shell Programming and Scripting Get 20 lines above string found, and 35 below string Post 302712583 by itkamaraj on Tuesday 9th of October 2012 10:22:18 AM
Old 10-09-2012
Quote:
Originally Posted by SkySmart
i want to search a log for a string. when that string is found, i want to grab the a set number of lines that came before the string, and a set number of lines that come after the string.

so if i search for the word "Error" in the /var/log/messages file, how can I output the 20 lines that came directly before it and the 35 lines that come after it..and also output the line that contained the specified string of "Error"?

im thinking a mixture of sed and awk can work here?

OS: Linux / SunOS
shell: bash
is your OS is linux or SunOS ?

if it is linux, you can use -A -B or -C in grep ( gnu grep )
This User Gave Thanks to itkamaraj For This Post:
SkySmart
 

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LEARN ABOUT SUSE

look

LOOK(1) 						    BSD General Commands Manual 						   LOOK(1)

NAME

     look -- display lines beginning with a given string

SYNOPSIS

     look [-dfa] [-t termchar] string [file]

DESCRIPTION

     The look utility displays any lines in file which contain string as a prefix.  As look performs a binary search, the lines in file must be
     sorted (where sort(1) got the same options -d and/or -f that look is invoked with).

     If file is not specified, the file /usr/share/dict/words is used, only alphanumeric characters are compared and the case of alphabetic char-
     acters is ignored.

     Options:

     -d      Dictionary character set and order, i.e. only alphanumeric characters are compared. (On by default if no file specified).

     -f      Ignore the case of alphabetic characters. (On by default if no file specified).

     -a      Use the alternate dictionary /usr/share/dict/web2

     -t      Specify a string termination character, i.e. only the characters in string up to and including the first occurrence of termchar are
	     compared.

     The look utility exits 0 if one or more lines were found and displayed, 1 if no lines were found, and >1 if an error occurred.

FILES

     /usr/share/dict/words  the dictionary
     /usr/share/dict/web2   the alternate dictionary

SEE ALSO

     grep(1), sort(1)

COMPATIBILITY

     The original manual page stated that tabs and blank characters participated in comparisons when the -d option was specified.  This was incor-
     rect and the current man page matches the historic implementation.

HISTORY

     Look appeared in Version 7 AT&T Unix.

AVAILABILITY

     The look command is part of the util-linux-ng package and is available from ftp://ftp.kernel.org/pub/linux/utils/util-linux-ng/.

BSD
								   June 14, 1993							       BSD
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