atd command in Linux with examples

Last Updated : 04 Apr, 2019

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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