I am not clear on the following:
Is the process for at available to all linux installations? Or do would I need to do something to "install" it?

2 Answers 2


Depending on your Linux distribution and the kind of installation (minimal, desktop-centric, etc.) at (and atd the at job scheduler daemon) is installed by default or not.

To verify it you can issue commands like:

$ which at
$ which atd
$ yum whatprovides atd # to get the package name 
$ yum info pkg-name # to see if it is installed

(assuming yum is available on Suse - using a Fedora system here)

If the package is not installed you can install it via your package manager, e.g. something like:

$ yum install at # on fedora at least

If it is installed, perhaps the daemon is not started on bootup by default.

To see if it running:

$ pgrep -l atd

Or just test it like this

$ echo echo hello world | at now

(watch your system logs in another terminal and/or check your local mailbox)

How to start it depends on your init-system, if it is old-school it would be something like:

$ /etc/init.d/atd start

If it is systemd it would be something like:

$ systemctl start atd

For a init.d based system as well for the systemd one there are also commands to display the status of a service like atd and to make it startup on boot.

But most likely atd is started by default after installation and it is setup by default to be started at system boot.

  • FWIW, a package called at also exists in various other packaging systems, as well... so on a system without yum, one might have success with sudo apt install at or other such things.
    – lindes
    Commented Feb 8, 2023 at 17:22

Essential on most systems, is a daemon, usually atd

  • I was looking through a book on SUSE and it said "You can use YaST to add at to the current run level." So I could not figure out what this means and if I would have at available in any system I run my script or not
    – Cratylus
    Commented Aug 8, 2013 at 19:17
  • To see if it's running, try 'ps aux | grep atd'. To check if it's installed, use 'whereis atd'. To see if it's set to run on boot, that depends on the init system you're using. Hope this is helpful.
    – schaiba
    Commented Aug 8, 2013 at 19:26

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