Command

At Command in Linux

At Command in Linux

at is a command-line utility that allows you to schedule commands to be executed at a particular time. Jobs created with at are executed only once. In this article, we will explain how to use at and its companion utilities batch , atq , atrm to view, delete, and create jobs to be executed at a later time.

  1. What does the AT command do?
  2. What is the use of AT command in Unix?
  3. What is use of at batch cron command?
  4. How do you kill a command in Linux?
  5. How do I look for jobs in Linux?
  6. How do I install commands?
  7. What is PS EF command in Linux?
  8. Who command in Linux?
  9. What is the use of crontab in Linux?

What does the AT command do?

The at command reads from standard input the names of commands to be run at a later time and allows you to specify when the commands should be run. The at command mails you all output from standard output and standard error for the scheduled commands, unless you redirect that output.

What is the use of AT command in Unix?

In Unix, the at and batch commands let you schedule non-interactive tasks that execute, respectively, at a specified time or as soon as system resources permit. Once a job is completed, the system sends you mail messages containing the job's output and errors, if any.

What is use of at batch cron command?

At and Batch. While cron is used to schedule recurring tasks, the at command is used to schedule a one-time task at a specific time and the batch command is used to schedule a one-time task to be executed when the systems load average drops below 0.8.

How do you kill a command in Linux?

The syntax of the kill command takes the following form: kill [OPTIONS] [PID]... The kill command sends a signal to specified processes or process groups, causing them to act according to the signal.
...
kill Command

  1. 1 ( HUP ) - Reload a process.
  2. 9 ( KILL ) - Kill a process.
  3. 15 ( TERM ) - Gracefully stop a process.

How do I look for jobs in Linux?

You can use the program atq to view your currently-queued at jobs. Type atq to display the queue.

How do I install commands?

If at is not installed, you can easily install it using the package manager of your distribution.

  1. Install at on Ubuntu and Debian sudo apt update sudo apt install at.
  2. Install at on CentOS and Fedora sudo yum install at.

What is PS EF command in Linux?

This command is used to find the PID (Process ID, Unique number of the process) of the process. Each process will have the unique number which is called as PID of the process.

Who command in Linux?

The standard Unix command who displays a list of users who are currently logged into the computer. The who command is related to the command w , which provides the same information but also displays additional data and statistics.

What is the use of crontab in Linux?

Crontab stands for "cron table". It allows to use job scheduler, which is known as cron to execute tasks. Crontab is also the name of the program, which is used to edit that schedule. It is driven by a crontab file, a config file that indicates shell commands to run periodically for the specific schedule.

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