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Full Discussion: grep a string in a file
Top Forums Shell Programming and Scripting grep a string in a file Post 302623309 by Corona688 on Friday 13th of April 2012 11:41:30 AM
Old 04-13-2012
grep is not a programming language. it can't be told to rewind 2 lines and print if it finds a match.

awk is a programming language and, while it can't rewind, it can save lines for later:

Code:
awk '{ LINES[(++L)%3]=$0 }; /comp/ && (L>2) { print LINES[(L-2)%3] }' filename

This User Gave Thanks to Corona688 For This Post:
 

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GREP(1) 						      General Commands Manual							   GREP(1)

NAME
grep - search a file for lines containing a given pattern SYNOPSIS
grep [-elnsv] pattern [file] ... OPTIONS
-e -e pattern is the same as pattern -c Print a count of lines matched -i Ignore case -l Print file names, no lines -n Print line numbers -s Status only, no printed output -v Select lines that do not match EXAMPLES
grep mouse file # Find lines in file containing mouse grep [0-9] file # Print lines containing a digit DESCRIPTION
Grep searches one or more files (by default, stdin) and selects out all the lines that match the pattern. All the regular expressions accepted by ed and mined are allowed. In addition, + can be used instead of * to mean 1 or more occurrences, ? can be used to mean 0 or 1 occurrences, and | can be used between two regular expressions to mean either one of them. Parentheses can be used for grouping. If a match is found, exit status 0 is returned. If no match is found, exit status 1 is returned. If an error is detected, exit status 2 is returned. SEE ALSO
cgrep(1), fgrep(1), sed(1), awk(9). GREP(1)
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