Linux timed Tasks

Create a timed task for the current user to automate the program at a specific time.

1. First enter CRONTAB-E edit crontab service file

For example: File contents are as follows

#00 */1 * * * CD/HOME/WORK/LIHEHAN/QUBUILD/EXTRA; SH build.sh 1>>err.log 2>&1

0 7 4 * CD home/work/mapred; Nohup sh run.sh >> nohup.out 2>&1

Save exit

2. Type crontab-l to see if the Crontab service under the user is created successfully

3. crontab Command options:

• -u Specifies a user
• -l lists a user's task schedule
• -R Delete a user's task
• -e Edit a user's tasks

4. cron file Syntax:

Hour of the week order

0-59 0-23 1-31 1-12 0-6 Command (value range, 0 for Sunday One a row corresponds to a task)

Remember the meanings of several special symbols:

• "*" represents a number in the range of values,
• "/" stands for "every",
• "-" represents a number to a number,
• "," separate a few discrete numbers

Linux timed Tasks