Crontab command Introduction

Introduction
Crontab-operate the daemon of each user Program And the execution schedule.

Some parameter descriptions
Crontab file [-u user]-replace the current crontab with the specified file.
Crontab-[-u user]-replace the current crontab with the standard input.
Crontab-1 [user]-list the current crontab of the user.
Crontab-E [user]-edit the current crontab of the user.
Crontab-d [user]-delete the current crontab of the user.
Crontab-C Dir-specifies the crontab directory.
Crontab file format: m h d m d cmd.
M: minute (0-59 ).
H: hour (0-23 ).
D: Day (1-31 ).
M: Month (1-12 ).
D: days in a week (0 ~ 6, 0 is Sunday ).
The program to be run by CMD is sent to SH for execution. The shell contains only three environment variables: User, home, and shell.
The following is an example file:
# Min hour day month dayofweek command
# Every morning
106 *** date

# Every two hours
0 */2 * Date

# Every two hours from PM to AM.
0 23-7/2, 8 **** date

# Am on the 4th day of each month and from Monday to Wednesday of each week
0 11 4 * Mon-wed date

# A.m. of July
0 4 1 Jan * Date
Example
Lark: ~> The crontab-1 lists the current crontab of the user.
# Min hour day month dayofweek command
10 6 **** date
0 */2 * Date
0 23-7/2, 8 **** date

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