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Why does my crontab job fail? 0 0 * * * some command > /var/log/mylog.`date +%Y%m%d`

In many versions of crontab, the percent sign (%) is treated specially, and therefore must be escaped with backslashes:

0 0 * * * some command > /var/log/mylog.`date +\%Y\%m\%d`

See your system's manual (crontab(5) or crontab(1)) for details. Note: on systems which split the crontab manual into two parts, you may have to type man 5 crontab or man -s 5 crontab to read the part you need.


2012-07-01 04:05