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Full Discussion: please explain the command
Top Forums Shell Programming and Scripting please explain the command Post 302262079 by jim mcnamara on Wednesday 26th of November 2008 09:53:15 AM
Old 11-26-2008
The unix sleep command
Code:
sleep <seconds>

sleeps for whole seconds. The code you gave sleeps for 150 millseconds. It actually takes longer than 150 milliseconds because the shell has to create a process and load perl into it, then "sleep" for 150 ms.
 

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Perl::Critic::Policy::BuiltinFunctions::ProhibitSleepViaUsercContributed Perl DPerl::Critic::Policy::BuiltinFunctions::ProhibitSleepViaSelect(3pm)

NAME
Perl::Critic::Policy::BuiltinFunctions::ProhibitSleepViaSelect - Use Time::HiRes instead of something like "select(undef, undef, undef, .05)". AFFILIATION
This Policy is part of the core Perl::Critic distribution. DESCRIPTION
Conway discourages the use of "select()" for performing non-integer sleeps. Although documented in perlfunc, it's something that generally requires the reader to read "perldoc -f select" to figure out what it should be doing. Instead, Conway recommends that you use the "Time::HiRes" module when you want to sleep. select undef, undef, undef, 0.25; # not ok use Time::HiRes; sleep( 0.25 ); # ok CONFIGURATION
This Policy is not configurable except for the standard options. SEE ALSO
Time::HiRes. AUTHOR
Graham TerMarsch <graham@howlingfrog.com> COPYRIGHT
Copyright (c) 2005-2011 Graham TerMarsch. All rights reserved. This program is free software; you can redistribute it and/or modify it under the same terms as Perl itself. perl v5.14.2 2012-06-07 Perl::Critic::Policy::BuiltinFunctions::ProhibitSleepViaSelect(3pm)
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