Linux timed Task execution

1) Write the shell script:

[email protected] cvv]# cat test1.sh

#!/bin/sh

/bin/date>>/home/cvv/test.log

echo "Hello world!" by cvv54 ">>/home/cvv/test.log

Give executable permission:

[Email protected] cvv]# chmod 777 test1.sh

2) Join the scheduled task queue with Crontab

Create a new cron file, write a program or command that requires a timed execution "absolute path required":

[email protected] cvv]# cat Rootcron

50,52,54 3 4/home/cvv/test1.sh

51,53,55 3 4/usr/bin/whoami>>/home/cvv/test.log

Submit a task to Cron:

[Email protected] cvv]# crontab Rootcron

To view tasks:

[Email protected] cvv]# crontab-l

#11月3日周四14点50-55 points Execute command

50,52,54 3 4/home/cvv/test1.sh

51,53,55 3 4/usr/bin/whoami>>/home/cvv/test.log

After the task is finished, delete:

[Email protected] cvv]# crontab-f

"Crontab usage: usage:crontab [-u user] File

crontab [-u user] [-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)

-S (selinux context) "

The basic format of the crontab file is as follows

* * * * * command

Time-of-day months and weeks commands "

3) View Job completion status

[email protected] cvv]# cat Test.log

Hello World! by cvv54

Reference: http://www.jb51.net/LINUXjishu/19905.html

Http://blog.sina.com.cn/s/blog_7db69afe01017eof.html

Linux timed Task execution