Running a task one time is handled by the AT service. The AT can either run the task at a certain time or date or it can run the task when the CPU load average falls below a certain level. Either way, once the task has been run it's deleted from the job list. The AT service allows many different types of date formats like now +5 min.
- [Instructor] There are two different types…of scheduled jobs.…One time jobs and recurring jobs.…For one time jobs we use a service called at.…The at service runs at jobs at a certain time.…Or in the case of a batch job,…when the CPU load average drops below 0.8.…The syntax for at is at, space,…and then the time format.…At supports a wide variety of time formats…including simple 12 and 24 hour clock times,…like 4:25 am, or 16:45.…
It also supports general terms like…midnight, noon, tomorrow, and now,…plus a specified number of minutes, hours or days.…It even supports teatime which is apparently at 4 pm.…If we don't want to schedule one time job today,…we can specify a time and date.…The time format always has to come before the date.…The at services is usually installed by default.…Let's be sure by installing it using Yum,…and if there's a newer version Yum will update it.…Type into a terminal sudo Space,…yum Space, install Space -y, Space at,…and hit Enter.…
Type in your password and hit Enter again.…We'll also want to ensure the service…
- Write the command that will take you to the most recent directory.
- Write the command that brings back the arguments and options from the previous line.
- Explain what extended globs can do.
- Identify the access.conf line that will restrict all users from using the cron service except for the user named bob.
- List the line that will get a list of only running services.
- Identify what typing ‘systemctl enable crond’ will do.
Skill Level Intermediate
Linux: User and Group Managementwith Grant McWilliams1h 8m Intermediate
1. Linux Shells Overview
2. Using the Bash Shell
3. Linux Processes
4. Job Scheduling
5. System Services
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