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caffeinate(8) [osx man page]

CAFFEINATE(8)						    BSD System Manager's Manual 					     CAFFEINATE(8)

caffeinate -- prevent the system from sleeping on behalf of a utility SYNOPSIS
caffeinate [-disu] [-t timeout] [utility] [argument ...] DESCRIPTION
caffeinate creates assertions to alter system sleep behavior. If no assertion flags are specified, caffeinate creates an assertion to pre- vent idle sleep. If a utility is specified, caffeinate creates the assertions on the utility's behalf, and those assertions will persist for the duration of the utility's execution. Otherwise, caffeinate creates the assertions directly, and those assertions will persist until caffeinate exits. Available options: -d Create an assertion to prevent the display from sleeping. -i Create an assertion to prevent the system from idle sleeping. -m Create an assertion to prevent the disk from idle sleeping. -s Create an assertion to prevent the system from sleeping. This assertion is valid only when system is running on AC power. -u Create an assertion to declare that user is active. If the display is off, this option turns the display on and prevents the display from going into idle sleep. If a timeout is not specified with '-t' option, then this assertion is taken with a default of 5 second timeout. -t Specifies the timeout value in seconds for which this assertion has to be valid. The assertion is dropped after the specified time- out. Timeout value is not used when an utility is invoked with this command. EXAMPLE
caffeinate -i make caffeinate forks a process, execs "make" in it, and holds an assertion that prevents idle sleep as long as that process is running. SEE ALSO
pmset(1) LOCATION
/usr/bin/caffeinate Darwin November 9, 2012 Darwin

Check Out this Related Man Page

Test::Unit::Assertion(3pm)				User Contributed Perl Documentation				Test::Unit::Assertion(3pm)

Test::Unit::Assertion - The abstract base class for assertions NAME
Any assertion class that expects to plug into Test::Unit::Assert needs to implement this interface. Required methods new Creates a new assertion object. Takes whatever arguments you desire. Isn't strictly necessary for the framework to work with this class but is generally considered a good idea. do_assertion This is the important one. If Test::Unit::Assert::assert is called with an object as its first argument then it does: $_[0]->do_assertion(@_[1 .. $#_]) || $self->fail("Assertion failed"); This means that "do_assertion" should return true if the assertion succeeds and false if it doesn't. Or, you can fail by throwing a Test::Unit::Failure object, which will get caught further up the stack and used to produce a sensible error report. Generally it's good practice for do_assertion to die with a meaningful error on assertion failure rather than just returning false. AUTHOR
Copyright (c) 2001 Piers Cawley <>. All rights reserved. This program is free software; you can redistribute it and/or modify it under the same terms as Perl itself. SEE ALSO
o Test::Unit::Assert o Test::Unit::CodeRef o Test::Unit::Regexp perl v5.8.8 2006-09-13 Test::Unit::Assertion(3pm)
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