1、crontab -e 进入crontab编辑
2、string meaning------ -------@reboot Run once, at startup.@yearly Run once a year, "0 0 1 1 *".@annually (same as @yearly)@monthly Run once a month, "0 0 1 * *".@weekly Run once a week, "0 0 * * 0".@daily Run once a day, "0 0 * * *".@midnight (same as @daily)@hourly Run once an hour, "0 * * * *".
3、以上几条命令看起来并不难理解，其他几个用处不大，倒是@reboot感觉非常实用，比写到rc.local里更方便好用。