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Top Forums Shell Programming and Scripting Wrapping 'sleep' with my 'resleep' function (Resettable sleep) Post 302356805 by cfajohnson on Sunday 27th of September 2009 07:50:58 PM
Old 09-27-2009
Quote:
Originally Posted by deckard
Code:
  dur=`cat /tmp/.dtime`


UUOC (there and in other places).

Code:
 read dur < /tmp/.dtime

Rather than repeating /tmp/.dtime every time you refer to the file, set a variable and use that when needed:

Code:
timefile=/tmp/.dtime     ## but see below
...
read dur < "$timefile"

What happens if you have two scripts running? One will mess up the file for the other.

You should create a unique filename for each instance, e.g.:

Code:
timefile=/tmp/.dtime$$

 

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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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