crontab+mplayer alarm clock Post: 302682229

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Top Forums Shell Programming and Scripting crontab+mplayer alarm clock Post 302682229 by hbar on Sunday 5th of August 2012 10:32:21 PM

08-05-2012

Registered User

Quote:

Originally Posted by agama

The way you have your command written, I wouldn't expect the volume to increase. The mixer command is invoked once, and if successful (&&) mplayer is invoked to play the mp3 looping through it 5 times.

If you want to bump the volume with each cycle through the file I would write a small script (alarm.bash or somesuch) and invoke that from cron. The script would look something like this:

Code:

#!/usr/bin/env bash
PLAYER=/usr/bin/mplayer
SONG=/home/hbar/Music/song.mp3

/usr/bin/amixer sset Master 35% >/dev/null 2>&1  # start with a default volume maybe??

for (( i = 0; i < 5; i++ ))
do
   /usr/bin/amixer sset Master 10%+ >/dev/null 2>&1
   $PLAYER -really-quiet -vo null $SONG >/dev/null 2>&1
done

In addition to Carona's suggestion, I'd toss in -really-quiet to cut the overhead of updates directed to /dev/null.

Are you meaning to execute from /etc/crontab? Can't I do it by

crontab <filename>.bash

?

hbar

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alarm(3)						     Library Functions Manual							  alarm(3)

Name
       alarm - schedule signal after specified time

Syntax
       #include <unistd.h>

       unsigned alarm(seconds)
       unsigned seconds;

Description
       The  subroutine	causes signal SIGALRM, see to be sent to the invoking process in a number of seconds given by the argument.  Unless caught
       or ignored, the signal terminates the process.

       The requests are not stacked.  Successive calls reset the alarm clock.  If the argument is 0, any request is canceled.  Because of schedul-
       ing delays, resumption of execution of when the signal is caught may be delayed an arbitrary amount.  The longest specifiable delay time is
       100000000 seconds. Values larger than 100000000 will be silently rounded down to 100000000.

       The return value is the amount of time previously remaining in the alarm clock.

Environment
       When your program is compiled using the System V environment, rounds up any positive fraction of a second to the next second.

       When your program is compiled using the POSIX environment, takes a parameter of type unsigned, and returns a value of type unsigned.

See Also
       getitimer(2), sigpause(2), sigvec(2), signal(3), sleep(3)

																	  alarm(3)

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