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Top Forums Shell Programming and Scripting Is this the "right" way to make an alarmclock? Post 302557819 by pludi on Thursday 22nd of September 2011 07:07:09 AM
Old 09-22-2011
DoW == Day of Week. Meaning the possibility to set different alarm times based on the day (wouldn't want the alarm to ring on 06:00 on a Saturday since I just went to bed Smilie )

@Skrynesaver: at does basically the same. But I think for someone who's just learning the hang of scripting, this is a good starting project, as it can be extended over time.
 

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ALARM(2)						     Linux Programmer's Manual							  ALARM(2)

NAME
alarm - set an alarm clock for delivery of a signal SYNOPSIS
#include <unistd.h> unsigned int alarm(unsigned int seconds); DESCRIPTION
alarm arranges for a SIGALRM signal to be delivered to the process in seconds seconds. If seconds is zero, no new alarm is scheduled. In any event any previously set alarm is cancelled. RETURN VALUE
alarm returns the number of seconds remaining until any previously scheduled alarm was due to be delivered, or zero if there was no previ- ously scheduled alarm. NOTES
alarm and setitimer share the same timer; calls to one will interfere with use of the other. sleep() may be implemented using SIGALRM; mixing calls to alarm() and sleep() is a bad idea. Scheduling delays can, as ever, cause the execution of the process to be delayed by an arbitrary amount of time. CONFORMING TO
SVr4, SVID, POSIX, X/OPEN, BSD 4.3 SEE ALSO
setitimer(2), signal(2), sigaction(2), gettimeofday(2), select(2), pause(2), sleep(3) Linux 1993-07-21 ALARM(2)
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