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Full Discussion: Is this the "right" way to make an alarmclock?
Top Forums Shell Programming and Scripting Is this the "right" way to make an alarmclock? Post 302557787 by ninjaaron on Thursday 22nd of September 2011 05:58:20 AM
Old 09-22-2011
Is this the "right" way to make an alarm clock?
I'm pretty unsophisticated in my scripting. I never followed a method
to learn, I just use google when I want to figure out how to use a
command or preform a certain function (and most of the results are from
here or the ABSG). Anyway, there are a lot of gaps in my knowledge.

So, I wanted to write a simple, multi-purpose alarm-clock. What
I've got is tiny, and it works. It reads the user-specified time and command, and
executes the command at the time then exits. Here it is:

Code:
#!/bin/bash

time="$1"
command="$2"
trig=0

while [ $trig = 0 ]; do
	if [ "$(date +%R)" = $time  ]; then
		$command
		trig=1
	else
		sleep 5
		
	fi
done
exit

So I can give it a line like...

alarm 07:00 'mplayer annoying-sound.ogg'

... and it plays the annoying sound at 7:00.

Then I checked google to see how others had created alarms. They were
all rather involved, calling functions and using all sorts of commands I
didn't recognize, and all substantially longer.

Is there any reason my rather humble implementation is undesirable or
problematic?
Last edited by ninjaaron; 09-22-2011 at 07:09 AM..
 

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LEARN ABOUT SUNOS

alarm

alarm(2)							   System Calls 							  alarm(2)

NAME

       alarm - schedule an alarm signal

SYNOPSIS

       #include <unistd.h>

       unsigned int alarm(unsigned int sec);

DESCRIPTION

       The alarm() function causes the system to generate a SIGALRM signal for the process after the number of real-time seconds specified by sec-
       onds  have  elapsed (see  signal.h(3HEAD)). Processor scheduling delays may prevent the process from handling the signal as soon as  it	is
       generated.

       If seconds is 0, a pending alarm request, if any, is cancelled.

       Alarm requests are not stacked; only one SIGALRM  generation can  be  scheduled in this manner; if the SIGALRM signal has not yet been gen-
       erated, the call will result in rescheduling the time at which the SIGALRM signal will be generated.

       The fork(2) function clears pending alarms in the child process. A new process image created by one of the exec functions inherits the time
       left to an alarm signal in the old process's image.

RETURN VALUES

       If  there  is  a previous alarm request with time  remaining, alarm() returns  a  non-zero  value  that	is the number of seconds until the
       previous request would  have  generated	a SIGALRM signal.  Otherwise, alarm() returns 0.

ERRORS

       The alarm() function is always successful; no return value is reserved to indicate an error.

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Interface Stability	     |Standard			   |
       +-----------------------------+-----------------------------+
       |MT-Level		     |Async-Signal-Safe 	   |
       +-----------------------------+-----------------------------+

SEE ALSO

       exec(2), fork(2), signal.h(3HEAD), attributes(5), standards(5)

SunOS 5.10							    7 Jun 2001								  alarm(2)
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