crontab+mplayer alarm clock Post: 302682227

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Top Forums Shell Programming and Scripting crontab+mplayer alarm clock Post 302682227 by agama on Sunday 5th of August 2012 10:16:46 PM

08-05-2012

Registered User

Quote:

Originally Posted by hbar

@agama.

Putting a baclslash makes it work. Thanks. However, voume does not keep on increasing!

@Corona688

I'm using gnome desktop in ubuntu 12.04. I copied the structure from the internet and many places \dev\null is mentioned. Now, as I just said, it's working but volume is not increasing by 10% !

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.

Last edited by agama; 08-05-2012 at 11:25 PM.. Reason: typo/added default volume setting

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endusershell

getusershell(3C)					   Standard C Library Functions 					  getusershell(3C)

NAME

       getusershell, setusershell, endusershell - get legal user shells

SYNOPSIS

       #include <unistd.h>

       char *getusershell(void);

       void setusershell(void);

       void endusershell(void);

DESCRIPTION

       The  getusershell()  function  returns  a  pointer  to  a  legal  user  shell  as defined by the system manager in the file /etc/shells. If
       /etc/shells does not exist, the following locations of the standard system shells are used in its place:

       /bin/bash		  /bin/csh
       /bin/jsh 		  /bin/ksh
       /bin/pfcsh		  /bin/pfksh
       /bin/pfsh		  /bin/sh
       /bin/tcsh		  /bin/zsh
       /sbin/jsh		  /sbin/pfsh
       /sbin/sh 		  /usr/bin/bash
       /usr/bin/csh		  /usr/bin/jsh
       /usr/bin/ksh		  /usr/bin/pfcsh
       /usr/bin/pfksh		  /usr/bin/pfsh
       /usr/bin/sh		  /usr/bin/tcsh
       /usr/bin/zsh		  /usr/xpg4/bin/sh

       The getusershell() function opens the file /etc/shells, if it exists, and returns the next entry in the list of shells.

       The setusershell() function rewinds the file or the list.

       The endusershell() function closes the file, frees any memory used by getusershell() and setusershell(), and rewinds the file /etc/shells.

RETURN VALUES

       The getusershell() function returns a null pointer on EOF.

BUGS

       All information is contained in memory that may be freed with a call to endusershell(), so it must be copied if it is to be saved.

SunOS 5.10							    30 Aug 2004 						  getusershell(3C)