atd command in Linux with examples

atd is a job scheduler daemon that runs jobs scheduled for later execution. These jobs are one-time task(not recurring) at a specific time scheduled using ‘at’ or ‘batch’ utility.

Syntax:

atd [-l load_avg] [-b batch_interval] [-d] [-f] [-s]

Options:



  • -l : Specifies a limiting load factor, over which batch jobs should not be run, instead of the compile-time choice of 1.5.
  • -b : Specify the minimum interval in seconds between the start of two batch jobs (60 default).
  • -d : Debug; print error messages to standard error instead of using syslog(3). This option also implies -f.
  • -f : Run atd in the foreground.
  • -s : Process the at/batch queue only once. This is primarily of use for compatibility with old versions of at; atd -s is equivalent to the old atrun command.

Starting atd:

  • To start atd in the current session, use below command:
    $ service atd start 
  • To start atd automatically at boot time, use below command:
    $ chkconfig atd on 
  • While using ‘at’ utility, the following issue can be seen:

    It means that atd is not running and needs to be started.

Stopping atd:

  • To stop atd in the current session, use below command:
    $ service atd stop 
  • To disable atd from starting at boot time, use below command:
    $ chkconfig atd off 

Restarting atd: To restart atd, use below command.

$ service atd restart 

Checking atd status: To determine if atd is running or not, use below command:

$ service atd status 
  • If atd is running, status will be “active”:

  • If atd is not running, status will be “inactive”:

    Example:



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