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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 302712553 by SkySmart on Tuesday 9th of October 2012 09:44:33 AM
Old 10-09-2012
Get 20 lines above string found, and 35 below string
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
 

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LEARN ABOUT HPUX

look

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

NAME

     look -- display lines beginning with a given string

SYNOPSIS

     look [-bdf] [-t termchar] string [file ...]

DESCRIPTION

     The look utility displays any lines in file which contain string as a prefix.

     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.

     The following options are available:

     -b, --binary
	     Use a binary search on the given word list. If you are ignoring case with -f or ignoring non-alphanumeric characters with -d, the
	     file must be sorted in the same way. Please note that these options are the default if no filename is given. See sort(1) for more
	     information on sorting files.

     -d, --alphanum
	     Dictionary character set and order, i.e., only alphanumeric characters are compared.

     -f, --ignore-case
	     Ignore the case of alphabetic characters.

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

ENVIRONMENT

     The LANG, LC_ALL and LC_CTYPE environment variables affect the execution of the look utility.  Their effect is described in environ(7).

FILES

     /usr/share/dict/words  the dictionary

EXIT STATUS

     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.

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.

     look uses a linear search by default instead of a binary search, which is what most other implementations use by default.

     The -a and --alternative flags are ignored for compatibility.

SEE ALSO

     grep(1), sort(1)

HISTORY

     A look utility appeared in Version 7 AT&T UNIX.

BUGS

     Lines are not compared according to the current locale's collating order.	Input files must be sorted with LC_COLLATE set to 'C'.

BSD
								   July 17, 2004							       BSD
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