一、场景
每天自动掘金签到
二、crontab工具
usage: crontab [-u user] file
crontab [ -u user ] [ -i ] { -e | -l | -r }
(default operation is replace, per 1003.2)
-e (edit user's crontab)
-l (list user's crontab)
-r (delete user's crontab)
-i (prompt before deleting user's crontab)
* * * * * command | | | | | | | | | +----- day of week (0 - 6) (Sunday=0) | | | +------- month (1 - 12) | | +--------- day of month (1 - 31) | +----------- hour (0 - 23) +------------- min (0 - 59)
$ crontab -l # Edit this file to introduce tasks to be run by cron. # # Each task to run has to be defined through a single line # indicating with different fields when the task will be run # and what command to run for the task # # To define the time you can provide concrete values for # minute (m), hour (h), day of month (dom), month (mon), # and day of week (dow) or use '*' in these fields (for 'any'). # # Notice that tasks will be started based on the cron's system # daemon's notion of time and timezones. # # Output of the crontab jobs (including errors) is sent through # email to the user the crontab file belongs to (unless redirected). # # For example, you can run a backup of all your user accounts # at 5 a.m every week with: # 0 5 * * 1 tar -zcf /var/backups/home.tgz /home/ # # For more information see the manual pages of crontab(5) and cron(8) # # m h dom mon dow command
三、添加定时任务
输入crontab -e进入编辑模式
然后添加定时任务
然后按下Ctrl + o,保存写入
然后回车保存
按住Ctrl +x离开
检查添加是否成功，可以使用crontab -l 查看
四、验证查看
可以看到今日已签到
查看执行日志
journalctl -u cron.service
按下Shift+g调到最后
或者，搜索使用 grep 搜索 cron 日志
grep CRON /var/log/syslog
参考链接：
https://blog.csdn.net/weixin_35757191/article/details/129084740
标签：run,签到,crontab,month,cron,user,day From： https://www.cnblogs.com/fireblackman/p/18279396