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Top Forums Shell Programming and Scripting Finding lines matching the Pattern and their previous lines in a file Post 302434343 by sagarparadkar on Friday 2nd of July 2010 07:44:28 AM
Old 07-02-2010
Finding lines matching the Pattern and their previous lines in a file

Hi,

I am trying to locate the occurences of certain pattern like 'Possible network disconnect' in a text file. I can get the actual lines matching the pttern using:

grep -w 'Possible network disconnect' file_name.

But I am more interested in getting the timing of these events which are located on the previous lines of those which match the pattern.

I tried some other techniques like:

while read LINE do
....
....
....
done< file_name

But could not extract the desired lines from the text file.

Can anyone help me accomplish desired results?

Thanks a million in advance.
 

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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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