oracle@dbservera ~]$ crontab -l

 0 0 * * * /u01/rmanbak/rmanbak.sh > /u01/rmanbak/rmanbak.log 2>&1

 [oracle@dbservera ~]$ cat /u01/rmanbak/rmanbak.sh

 #!/bin/bash



 . ~/.bash_profile



 echo -------------------------start-----------------------;date

 rman target/<<EOF

 backup as compressed backupset database include current controlfile format '/u01/rman/rmanbak/full_%U.bak';

 delete noprompt obsolete;

 delete noprompt force archivelog all completed before 'sysdate-7';

 exit;

 EOF

 echo -------------------------end-----------------------;date



注意：EOF后面不要有空格，不然会有警告


总之一共三步，首先创建备份脚本，之后创建备份的目标目录（要注意目录权限），最后通过crontab -e -u oracle来编辑oracle的执行计划。