Using the at command to arrange jobs on Linux

To set up a command or script to perform at some specific time, the at command is ideal and provides many alternatives for defining the time you desire it to run. It will set the job approximately be run whenever you specify, and you can view the set up tasks or perhaps alter your mind and cancel one of them as you see fit.The at command varies from cron because it sets up a command or script to run just when, while cron permits you to establish commands or scripts to be operated on a defined schedule — whether every day, once a week, a couple times a month and even simply once a year.at command syntax Using the at command is relatively easy, though it has a great deal of alternatives, particularly on how you define the time a task should be run. If you specify a time like revealed below, the task will be set up to be run the next time you reach 15:27 (3:27 PM ), whether that’s today or tomorrow.$at 15:27 warning: commands will be executed using/ bin/sh at Wed Mar 15 15:27:00 2023 at > echo”It works!”>/ tmp/test at > task 5 at Wed Mar 15 15:27:00 2023 End the at command by pressing ^ D.In the next example, the command is set to run the list below date at the time defined.$ at 12:34 tomorrow warning: commands will be executed using/ bin/sh at Wed Mar 15 12:34:00 2023 at > echo 1234 >>/ tmp/wow at > task 6 at Wed Mar 15 12:34:00 2023 You can specify the time of day in either of 2 formats. If you ask to have a command run at 11:11, it will be performed at 11:11 AM. To specify it to run at 11:11 PM, usage 23:11 or 11:11 pm as the time. Dates can be also specified in any of these formats: MMDD [CC] YY MM/DD/ [CC] YY DD.MM. [CC] YY [CC] YY-MM-DD You can also define a job on some particular date by specifying a weekday(

e.g., Sunday).$at twelve noon Wednesday caution: commands will be executed using/ bin/sh at Wed Mar 15 12:00:00 2023 at > date >>/ tmp/test at > task 7 at Wed Mar 15 12:00:00 2023 Listing at jobs To list the tasks arranged with the at command, utilize the atq(at line) command. $atq

5 Wed Mar 15 15:27:00 2023 a shs 6 Wed Mar 15 12:34:00 2023 a shs 7 Wed Mar 15 12:00:00 2023 a shs

The command reveals the jobs waiting to be run, but not the tasks they will be running. The information just consist of the task

numbers, the times they will run and the user who added them. Just root is able to see all of the arranged tasks. Other users will see just their own.Deleting at jobs You can cancel an arranged job with the atrm command. $atrm 5$atq 6 Wed Mar 15 12:34:00 2023

a shs 7 Wed Mar 15 12:00:00 2023 a shs The command below supplies a list of commands related to the at command. $sudo dnf repoquery -l at|grep bin [sudo] password for shs: Last metadata expiration check: 1:16:38 earlier on Fri 10 Mar 2023 01:40:19 PM EST./ usr/bin/at/ usr/bin/atq/ usr/bin/atrm/ usr/bin/batch/ usr/sbin/atd/ usr/sbin/atrun/ usr/bin/a Wrap-up Routinely set up tasks must be set up utilizing the cron command, however to run some particular task at some particular time (no … Source