10-19-2001
If it's that large, to where wc takes a long time, perhaps it's time to either split the file up, or impliment some database system.
The only thing I can think of is to use tac to pipe it through grep, and possibly the results of THAT through head.
Also, lest we not forget our Unix toolboxes, Perl may be able to do that. I'm not very proficient with Perl yet, so I can't help more there...
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LEARN ABOUT DEBIAN
perl::critic::policy::builtinfunctions::prohibitbooleangrep
Perl::Critic::Policy::BuiltinFunctions::ProhibitBooleanGUser3Contributed Perl DocuPerl::Critic::Policy::BuiltinFunctions::ProhibitBooleanGrep(3pm)
NAME
Perl::Critic::Policy::BuiltinFunctions::ProhibitBooleanGrep - Use "List::MoreUtils::any" instead of "grep" in boolean context.
AFFILIATION
This Policy is part of the core Perl::Critic distribution.
DESCRIPTION
Using "grep" in boolean context is a common idiom for checking if any elements in a list match a condition. This works because boolean
context is a subset of scalar context, and grep returns the number of matches in scalar context. A non-zero number of matches means a
match.
But consider the case of a long array where the first element is a match. Boolean "grep" still checks all of the rest of the elements
needlessly. Instead, a better solution is to use the "any" function from List::MoreUtils, which short-circuits after the first successful
match to save time.
CONFIGURATION
This Policy is not configurable except for the standard options.
CAVEATS
The algorithm for detecting boolean context takes a LOT of shortcuts. There are lots of known false negatives. But, I was conservative in
writing this, so I hope there are no false positives.
AUTHOR
Chris Dolan <cdolan@cpan.org>
CREDITS
Initial development of this policy was supported by a grant from the Perl Foundation.
COPYRIGHT
Copyright (c) 2007-2011 Chris Dolan. Many rights reserved.
This program is free software; you can redistribute it and/or modify it under the same terms as Perl itself. The full text of this license
can be found in the LICENSE file included with this module.
perl v5.14.2 2012-06-07 Perl::Critic::Policy::BuiltinFunctions::ProhibitBooleanGrep(3pm)