#method 1
crontab -e crontab -u root -e #不同用户自己的任务计划 crontab -l#method 2
vim /etc/crontab# Example of job definition: # .---------------- minute (0 - 59) # | .------------- hour (0 - 23) # | | .---------- day of month (1 - 31) # | | | .------- month (1 - 12) OR jan,feb,mar,apr ... # | | | | .---- day of week (0 - 6) (Sunday=0 or 7) OR sun,mon,tue,wed,thu,fri,sat # | | | | | # * * * * * user-name command to be executed这个目录下面很多已经存在的系统级别的计划任务 ll /etc/cron*/etc/cron.d ├── 0hourly ├── raid-check └── sysstat /etc/cron.daily ├── cups ├── logrotate ├── makewhatis.cron ├── mlocate.cron └── tmpwatch /etc/cron.deny [error opening dir] /etc/cron.hourly └── 0anacron /etc/cron.monthly /etc/crontab [error opening dir] /etc/cron.weekly
