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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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sleep(3C)																 sleep(3C)

NAME
sleep - suspend execution for an interval of time SYNOPSIS
#include <unistd.h> unsigned int sleep(unsigned int seconds); The caller is suspended from execution for the number of seconds specified by the argument. The actual suspension time may be less than that requested because any caught signal will terminate the sleep() following execution of that signal's catching routine. The suspension time may be longer than requested by an arbitrary amount because of the scheduling of other activity in the system. The value returned by sleep() will be the ``unslept'' amount (the requested time minus the time actually slept) if the caller incurred premature arousal because of a caught signal. The use of the sleep() function has no effect on the action or blockage of any signal. In a multithreaded process, only the invoking thread is suspended from execution. See attributes(5) for descriptions of the following attributes: +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |Interface Stability |Standard | +-----------------------------+-----------------------------+ |MT-Level |Async-Signal-Safe | +-----------------------------+-----------------------------+ nanosleep(3RT), attributes(5), standards(5) 16 Mar 2005 sleep(3C)
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