Linux task scheduling exercises

Case 1: Every 1 minute, append the current date information to the / tmp / mydate file

1. First write a file /home/mytask1.sh, write the following command
   date >> / tmp / mydate in the file
2. Give mytask1.sh an executable permission of
   chmod 744 /home/mytask1.sh
3. crontab -e
4. */1 * * * * /home/mytask1.sh

Case 2: Every 1 minute, append the current date and calendar to the / home / mycal file

1. First write a file /home/mytask2.sh

date >> /tmp/mycal cal >> /tmp/mycal

2. Give mytask1.sh an executable permission

chmod 744 /home/mytask2.sh

crontab -e

*/1 * * * *	/home/mytask2.sh

Backup the mysql database testdb to the file
mydb.bak at 2:00 AM every day .

1. First write a file /home/mytask3.sh

/usr/local/mysql/bin/mysqldump -u root -proot testdb > /tmp/mydb.bak

2. Give mytask3.sh an executable permission

chmod 744 /home/mytask3.sh

crontab -e

0 2 * * *	/home/mytask3.sh

crond related instructions:

1. conrtab -r: Terminate task scheduling.
2. crontab –l: List those tasks currently scheduled
3. service crond restart [Restart task scheduling]