时间格式
crontab -e 具体配置
# 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 # 分钟 小时 某天 某月 星期几 命令 0 23 * * * /root/scripts/login_day.sh 0 23 * * 7 /root/scripts/login_week.sh 0 0 1 * * /root/scripts/login_month.sh # total used time(hours) of every province for everyday 0 23 * * * /root/scripts/day_total_used_time.sh examples
Every Minute * * * * * Every Five Minutes */5 * * * * Every 10 Minutes */10 * * * * Every 15 Minutes */15 * * * * Every 30 Minutes */30 * * * * Every Hour 0 * * * * Every Two Hours 0 */2 * * * Every Six Hours 0 */6 * * * Every 12 Hours 0 */12 * * * During the Work Day */5 9-17 * * * Every day at Midnight 0 0 * * * Every Two Weeks 0 0 * * Sun [ $(expr $(date +%W) % 2) -eq 1 ] && /path/to/command At the Start of Every Month 0 0 1 * * On January 1st at Midnight 0 0 1 1 * References
- https://pubs.opengroup.org/onlinepubs/9699919799/utilities/crontab.html#tag_20_25_07
- https://crontab.guru/examples.html
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