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Crontab problem...

Posted on 2008-10-29
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Last Modified: 2013-12-16
I don't know how to start... don't know why is happening... but here it goes...


I have set up webcam on linux, and I wanted to automate the process, so I found a page with two files one to stop the webcam and the other to start it, to be on the safe side it should be run at midnight pss some minutes.. using crontab...

ok if I run the program from the console, the images are created with 664 permissions wich that's what I want and it should be, since the program is executed by the user and it is in the user bin folder /home/user/bin and images are stored in a user's folder /home/user/pics

but if I set up cron...

crontab -u user -e

<vars>
<whatever>
<path add path to bin's user> {either this or...}

* * * * * /home/user/bin/webcamstart {this is the same I think and both are declared}


Why cron thinks like the executor is root??? or why does it change it from 664 to 644???


I  hope I made my self clear...
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Comment
Question by:My name is Mud
6 Comments
 
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Author Comment

by:My name is Mud
ID: 22838652
Oh forgot to mention that I didn't knew the /etc/crontab fileshouldn't be edited manually, which I did and put something like


* * * * * user /home/user/bin/webcamstart



This is the real cronfile for user...
SHELL=/bin/sh
HOME=/home/user
PATH=/usr/bin:/bin:/home/user/bin
LOGNAME=user
USER=user

02 00 * * * /home/user/bin/webcamstop
03 00 * * * /home/user/bin/webcamstart
06 00 * * * /home/user/bin/mkmovie
* * * * * /home/user/bin/createmask

Webcamstart starts the webcam and all images are 644 instead of 664 as well as mkmovie which starts the mencoder to create a movie out of the files from yesterday folder... and again, movie is 644 instead of 664... so what am I doing wrong???
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Author Comment

by:My name is Mud
ID: 22838656
oh and puting manually the comands in crontab did work with the same results as root...
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Accepted Solution

by:
Tintin earned 400 total points
ID: 22839019
You need to set the umask, eg:

03 00 * * * umask 002 ;  /home/user/bin/webcamstart
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LVL 40

Assisted Solution

by:omarfarid
omarfarid earned 100 total points
ID: 22841257
As Tintin recommended, it is because of the umask of the process that runs the command. I think in your user profile you are setting umask to 002 while when crontab is run it uses the default umask of 022
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Expert Comment

by:eager
ID: 22841722
Don't set umask in crontab.  Set permissions in the script.
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Author Closing Comment

by:My name is Mud
ID: 31511562
Thanks to both...
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