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Homework and Emergencies Homework & Coursework Questions Grep commands: need some practice help please Post 302998626 by bakunin on Monday 5th of June 2017 07:04:39 AM
Old 06-05-2017
Quote:
Originally Posted by asaint
You can pipe the output of a grep command into wc -l to count lines instead of displaying them.
You are perhaps not supposed to know that, but to show you that it pays off to come to unix.com for advice, here is how you might earn bonus points:

There is a way you can do that (counting that is) without using wc -l. You can find out how by carefully reading the man page of grep as Neo suggested.

You might also want to read this to get you started.

I hope this helps.

bakunin

Last edited by bakunin; 06-05-2017 at 08:12 AM..
 

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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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