Am 20.06.2011 00:37, schrieb Grant: > One of my systems has a crontab like this to clean up and consolidate > the output of the video monitoring app "motion": > > # crontab -l > # DO NOT EDIT THIS FILE - edit the master and reinstall. > # (/home/grant/cron.root.txt installed on Sat Sep 25 10:42:18 2010) > # (Cron version V5.0 -- $Id: crontab.c,v 1.12 2004/01/23 18:56:42 vixie Exp $) > 50 23 * * * /bin/rm /home/motion/$(date -d 'yesterday' +%Y%m%d)*.jpg > 55 23 * * * /bin/rm /home/motion/$(date -d 'yesterday' +%Y%m%d)*.avi > 59 23 * * * /usr/bin/mencoder /home/motion/$(date +%Y%m%d)*.avi -noidx > -o /home/motion/full-$(date +%Y%m%d).avi -ovc copy -oac copy > > If I execute each command manually, it works great, but nothing > happens otherwise. Can someone tell me why this crontab doesn't seem > to be executing? > > - Grant >
I might be wrong but as I understand it, cron executes your commands in /bin/sh, not /bin/bash. Therefore you should use the `date -d 'yesterday' +%Y%m%d` syntax instead of $(date -d 'yesterday' +%Y%m%d). Additionally, % signs are replaced with newlines. You have to escape them: `date -d 'yesterday' +\%Y\%m\%d` Hope this helps, Florian Philipp
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