I am trying to capture a picture with my webcam and I need to log the output to check for errors, but cron is failing at this. I am able to do this from terminal, but cron running it doesn't work.
Here's the script:
#!/bin/bash script -ac "fswebcam -c /home/webcam/webcam.conf" /data/webcam/logscript.txt
Crontab:
@reboot mv /home/webcam/tmp/* /home/webcam/tmp_lost/ * * * * * sh /data/webcam/script.sh > /data/webcam/log.txt 2>&1
Terminal output:
[webcam@raspberry-pi webcam]$ sh /data/webcam/script.sh Script started, file is /data/webcam/logscript.txt --- Opening V4L2:/dev/video0... /dev/video0 opened. Setting Brightness to 0 (50%). Setting Contrast to 19 (20%). --- Capturing frame... Skipping 50 frames... Timed out waiting for frame! Capturing 1 frames... Timed out waiting for frame! Captured frame in 0.00 seconds. No frames captured. Script done, file is /data/webcam/logscript.txt
logscript.txt (generated by script command) when ran from terminal:
[webcam@raspberry-pi webcam]$ cat logscript.txt Script started on ke 21. elokuuta 2013 21.10.52 --- Opening V4L2:/dev/video0... /dev/video0 opened. Setting Brightness to 0 (50%). Setting Contrast to 19 (20%). --- Capturing frame... Skipping 50 frames... Capturing 1 frames... gd-jpeg: JPEG library reports unrecoverable error: Not a JPEG file: starts with 0xba 0x28 Captured 51 frames in 3.91 seconds. (13 fps) --- Processing captured image... Flipping image horizontally. Flipping image vertically. Putting banner at the bottom. Setting banner background colour to #FF000000. Setting banner line colour to #FF000000. Setting banner text colour to #FFFF00. Setting font to luxisr:12. Setting timestamp "%d.%m.%Y %H:%M". Writing JPEG image to '/home/webcam/tmp.jpg'. Script done on ke 21. elokuuta 2013 21.10.57
Running it through cron. Cron output -> log.txt
[webcam@raspberry-pi webcam]$ cat log.txt Script started, file is /data/webcam/logscript.txt Script done, file is /data/webcam/logscript.txt --- Opening V4L2:/dev/video0... /dev/video0 opened. Setting Brightness to 0 (50%). Setting Contrast to 19 (20%). --- Capturing frame... Skipping 50 frames... Capturing 1 frames... gd-jpeg: JPEG library reports unrecoverable error: Not a JPEG file: starts with 0x8e 0x80 Captured 51 frames in 3.38 seconds. (15 fps) --- Processing captured image... Flipping image horizontally. Flipping image vertically. Putting banner at the bottom. Setting banner background colour to #FF000000. Setting banner line colour to #FF000000. Setting banner text colour to #FFFF00. Setting font to luxisr:12. Setting timestamp "%d.%m.%Y %H:%M". Writing JPEG image to '/home/webcam/tmp.jpg'. Script started, file is /data/webcam/logscript.txt
logscript.txt file is empty after cron and that is the problem. As you can see: when running from cron, the script-command is started and done'd before any output happens. When in terminal it is fine. Anyone know why this is happening?