linux crontab task execution plan

Some common command crontab

service crond start // Start Service

service crond stop // shut down service

service crond restart // restart the service

service crond reload // reload the configuration

chmod + x dbackup.sh backup script to change permissions

crontab -e to open the Scheduled Tasks file

SHELL=/bin/sh
PATH=/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin

/1 * * * /usr/local/qcloud/stargate/admin/start.sh > /dev/null 2>&1 &

/20 * * * /usr/sbin/ntpdate ntpupdate.tencentyun.com >/dev/null &

---- bakup.sh task to be performed

---- * / 5 * * * * performed once every 5 minutes

• /5 * * * * /home/bak/bakup.sh
• • /1 * * * /home/bak/bakup60.sh
    0 1 * * * /home/bak/bakup30day.sh
• • /2 * * * /home/bak/bakupall.sh

// view the situation crontab task execution

tail -f /var/log/syslog

5 * * * * ls // The first five minutes of every hour to perform a specified command ls

30 5 * * * ls // specified daily 5:30 ls command

30 7 8 * * ls // specify the number of each month at 7:30 8 ls command

30 5 8 6 * ls // designated each year at 5:30 on June 8 ls command

30 6 * * 0 ls // specify every Sunday at 6:30 of the ls command [Note: 0 for Sunday, 1 for 1 week, and so on, can be expressed in English, sun for Sunday, mon for Monday, etc. . ]

30 3 10,20 * * ls 3:30 ls // performed monthly No. 20 and No. 10 a command [Note: "," used to connect a plurality of discontinuous period]

25 8-11 * * * ls // 25 minutes per day point execution command ls 8-11 [Note: "-" is used to connect a continuous time]

/ 15 * * * ls // performed once every 15 minutes ls command [i.e., each hour of 015,304,560 minutes ls command]

6 30 /10 * ls // each month, 10 days 6:30 perform a ls command [ie, 1 month, 11, 21, 31, is the ls command executed once every 6:30. ]

50 7 * * * root run-parts /etc/cron.daily // daily 7:50 /etc/cron.daily execute all executable files in the directory as root [Note: run-parts argument said that after execution