1

crontab中下面的脚本不能

 0 1 * * *   (cd /u01/prod; rsync -avz app 192.168.0.192:/u01/prod/) &>/home/applprod/backuplog/rsync_`date +%Y%m%d_%H%M%S`.log

执行的时候,/var/log/messages日志中显示:

Sep 22 22:50:01 ebsapp CROND[13389]: (applprod) CMD ((cd /u01/prod; rsync -avz app 192.168.0.192:/u01/prod/) &>/home/applprod/backuplog/rsync_`date +)

好像是命令被截断的样子。
于是我把要执行的命令都封装到一个脚本中,放到crontab中执行。

但是稍后查看crontab的manpage时发现,%在crontab中有特殊含义:

The  "sixth"  field (the rest of the line) specifies the command to be run.  The entire command portion of the line, up to a new-
       line or % character, will be executed by /bin/sh or by the shell specified in the SHELL variable of the cronfile.   Percent-signs
       (%)  in  the  command, unless escaped with backslash (\), will be changed into newline characters, and all data after the first %
       will be sent to the command as standard input.

到这里问题已经清楚了,并不是crontab命令被截断,而是被理解成另外的含义了,解决的方法也有了,就是将%进行转义,修改之后的脚本变成了:

03 23 * * * (cd /u01/prod; rsync -avz app 192.168.0.192:/u01/prod/) &>/home/applprod/backuplog/rsync_`date +\%Y\%m\%d_\%H\%M\%S`.log

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