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Finding lines matching the Pattern and their previous lines in a file

 
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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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LEARN ABOUT OPENDARWIN

tcl_stringcasematch

Tcl_StringMatch(3)					      Tcl Library Procedures						Tcl_StringMatch(3)

__________________________________________________________________________________________________________________________________________________

NAME

       Tcl_StringMatch, Tcl_StringCaseMatch - test whether a string matches a pattern

SYNOPSIS

       #include <tcl.h>

       int
       Tcl_StringMatch(string, pattern)

       int
       Tcl_StringCaseMatch(string, pattern, nocase)

ARGUMENTS

       char	    *string	       (in)	 String to test.

       char	    *pattern	       (in)	 Pattern to match against string.  May contain special characters from the set *?[].

       int	    nocase	       (in)	 Specifies whether the match should be done case-sensitive (0) or case-insensitive (1).
_________________________________________________________________

DESCRIPTION

       This  utility  procedure  determines  whether  a  string  matches  a given pattern.  If it does, then Tcl_StringMatch returns 1.  Otherwise
       Tcl_StringMatch returns 0.  The algorithm used for matching is the same algorithm used in the ``string match'' Tcl command and  is  similar
       to the algorithm used by the C-shell for file name matching;  see the Tcl manual entry for details.					   |

       In  Tcl_StringCaseMatch,  the algorithm is the same, but you have the option to make the matching case-insensitive.  If you choose this (by |
       passing nocase as 1), then the string and pattern are essentially matched in the lower case.

KEYWORDS

       match, pattern, string

Tcl									8.1							Tcl_StringMatch(3)