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Full Discussion: Grep Log file
Top Forums UNIX for Dummies Questions & Answers Grep Log file Post 302199766 by cbo0485 on Tuesday 27th of May 2008 09:59:03 PM
Old 05-27-2008
Grep Log file

Okay, I got a log file, and I need to use a combo of the tail -f command and the grep command, but I don't want to see all the output, other than what I'm "grepping". As well I'd like it to stop tailing and searching and just return to the command line, once it finds 1 line with that string in it. Something like this:

./scriptThatGeneratesLogFile.sh; tail -f | grep RUN logfile.out

Edit:

It doesn't have to be the grep command, or even the tail command. Those are just the two I'm somewhat familiar with and use the most.
 

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SVK::Log::Filter::Grep(3)				User Contributed Perl Documentation				 SVK::Log::Filter::Grep(3)

SYNOPSIS
SVK::Log::Filter::Grep - search log messages for a given pattern DESCRIPTION
The Grep filter requires a single Perl pattern (regular expression) as its argument. The pattern is then applied to the svn:log property of each revision it receives. If the pattern matches, the revision is allowed to continue down the pipeline. If the pattern fails to match, the pipeline immediately skips to the next revision. The pattern is applied with the /i modifier (case insensitivity). If you want case-sensitivity or other modifications to the behavior of your pattern, you must use the "(?imsx-imsx)" extended pattern (see "perldoc perlre" for details). For example, to search for log messages that match exactly the characters "foo" you might use svk log --filter "grep (?-i)foo" However, to search for "foo" without regards for case, one might try svk log --filter "grep foo" The result of any capturing parentheses inside the pattern are not available. If demand dictates, the Grep filter could be modified to place the captured value somewhere in the stash for other filters to access. If the pattern contains a pipe character ('|'), it must be escaped by preceding it with a '' character. Otherwise, the portion of the pattern after the pipe character is interpreted as the name of a log filter. STASH
/PROPERTY MODIFICATIONS Grep leaves all properties and the stash intact. perl v5.10.0 2008-08-04 SVK::Log::Filter::Grep(3)
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