Problem executing script through at

Shell Programming and Scripting
1

Hey fellows,

i've got a probkem while executing a command through a scheduled at-job;
Somehow my script starts looping, when triggered throug at;
It doesnt do so if started manually.
Any ideas?

#!/bin/sh
# atrun uid=33 gid=33
# mail www-data 0
umask 22
cd /var/django/webripper/ripper || {
     echo 'Execution directory inaccessible' >&2
     exit 1
}
set -o xtrace ; mplayer -dumpstream mms://stream1.orf.at/fm4_live -really-quiet -dumpfile /var/www/media/recordings/test.wmv < /dev/null &> /dev/null & 
MPID=$! ; echo $$ > /var/www/media/recordings/test.pid ; 
echo $MPID $$ $! ; 
sleep 60 ;
kill $MPID ; 
exit 0 ;

here's the output when xtrace is enabled:

Subject: Output from your job       20
To: www-data

+ mplayer -dumpstream mms://stream1.orf.at/fm4_live -really-quiet -dumpfile /var/www/media/recordings/test.wmv
+ MPID=20360
+ echo 20357
+ echo 20360 20357 20360
20360 20357 20360
+ sleep 60
+ ev/null
+ MPID=22321
+ echo 20357
+ echo 22321 20357 22321
22321 20357 22321
+ sleep 60

I have no idea where the

ev/null

is coming from, neither why the whole thing starts looping.

I'm using Debian 4.0 btw.

thanks in advance for any advice
viktor

2

can you paste the how you are starting this job with at command
and kill $MPID won't kill the process it will just stop the process if you wanna kill use
kill -kill pid or kill -9 pid

3

when starting manually I do it the followin way:

# sudo -u www-data /bin/sh  atjob_xtrace.sh 
+ mplayer -dumpstream mms://stream1.orf.at/fm4_live -really-quiet -dumpfile /var/www/media/recordings/test.wmv
+ MPID=5693
+ echo 5692
+ echo 5693 5692 5693
5693 5692 5693
+ sleep 60
+ kill 5693
+ exit 0

starting through at involves:

# sudo -u www-data at now -f atjob_xtrace.sh 
warning: commands will be executed using /bin/sh
job 22 at Mon Apr  6 19:51:00 2009

# cat /var/spool/cron/atspool/a00016013b1aaf 
Subject: Output from your job       22
To: root

+ mplayer -dumpstream mms://stream1.orf.at/fm4_live -really-quiet -dumpfile /var/www/media/recordings/test.wmv
+ MPID=20321
+ echo 20318
+ echo 20321 20318 20321
20321 20318 20321
+ sleep 60
+ dev/null
+ MPID=21911
+ echo 20318
+ echo 21911 20318 21911
21911 20318 21911
+ sleep 60

edit: ah, ja and atjob_xtrace.sh is the script shown in my first post

thx in advance
viktor