CAFFEINATE(8) System Manager's Manual CAFFEINATE(8)
caffeinate – prevent the system from sleeping on behalf of a utility
caffeinate [-disu] [-t timeout] [-w pid] [utility arguments...]
caffeinate creates assertions to alter system sleep behavior. If no
assertion flags are specified, caffeinate creates an assertion to prevent
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.
-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
-t Specifies the timeout value in seconds for which this assertion has
to be valid. The assertion is dropped after the specified timeout.
Timeout value is not used when an utility is invoked with this
-w Waits for the process with the specified pid to exit. Once the the
process exits, the assertion is also released. This option is
ignored when used with utility option.
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.
Darwin November 9, 2012 Darwin