Linux Crontab usage

Cron is a [daemonProgram] Is used to execute a travel task within a specified time period. each user has a crontab file to allow them to specify the content and time to be executed. In addition, the system also has a crontab, allows tasks with rules such as alternating logs and updating local data.

Edit your own

Crontab :~ # Sudo crontab-e

An editing window will be opened. The first line will show the content format prompt:

# M h Dom mon Dow command

Specific meaning: minute Hour Date month week command, in a month (Mon) One day (DOM) or the day of the week (Dow) (H, 24 hours) A minute (m) executes a command, * indicates any time. For example:

3 ***/home/Ubuntu/Hello. Sh

Indicates to execute hello. Sh at every day.

After the system is restarted, test the normal running of crontab under the Ubuntu user. Java-Javascript