buggrep - Bugs: bug #15280, Feature request: better support...


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bug #15280: Feature request: better support for multiple patterns

Submitted by:  Ed Avis <epaepa>
Submitted on:  Fri 23 Dec 2005 11:01:56 AM UTC  
Category:  None Severity:  3 - Normal
Item Group:  None Status:  None
Privacy:  Public Assigned to:  None
Open/Closed:  Closed

Fri 04 Dec 2009 07:56:51 PM UTC, comment #1:

Duplicate of 22100.

Paolo Bonzini <bonzini>
Fri 23 Dec 2005 11:01:56 AM UTC, original submission:

Grep lets you specify more than one pattern using multiple -e options. Then a line matches if any of the patterns match. Effectively each -e means 'or'.

It would be useful to have -and and -not options a la find(1), so

% grep -e hello -and -e there

to match lines containing both words. This simple example could be done with two grep processes in a pipeline, but it's certainly faster to grep the file once, and once you start adding context:

% grep --context=10 -e hello -and -e there

it's not really possible to get the same search with two separate greps.

The -v flag negates the sense of matching but it applies globally. You cannot ask grep to print lines matching one pattern but not another. As far as I know, grep's regular expressions don't have a negation operator so this would be an increase in grep's power. And handy together with -and, for example

% grep --context=10 -e '\*\*\*' -and -not -e 'modification time'

as a way to search your build logs for make errors which aren't the common 'modification time in the future'.

Ed Avis <epaepa>


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    Follows 1 latest change.

    Date Changed by Updated Field Previous Value => Replaced by
    2009-12-04 bonzini Open/ClosedOpen => Closed

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