35.2.1. Configuring At Jobs

35.2.1. Configuring At Jobs

To schedule a one-time job at a specific time, type the command at time, where time is the time to execute the command.

The argument time can be one of the following:

The time must be specified first, followed by the optional date. For more information about the time format, read the /usr/share/doc/at-<version>/timespec text file.

After typing the at command with the time argument, the at> prompt is displayed. Type the command to execute, press Enter, and type Ctrl-D . Multiple commands can be specified by typing each command followed by the Enter key. After typing all the commands, press Enter to go to a blank line and type Ctrl-D . Alternatively, a shell script can be entered at the prompt, pressing Enter after each line in the script, and typing Ctrl-D on a blank line to exit. If a script is entered, the shell used is the shell set in the user's SHELL environment, the user's login shell, or /bin/sh (whichever is found first).

If the set of commands or script tries to display information to standard out, the output is emailed to the user.

Use the command atq to view pending jobs. Refer to Section 35.2.3, “Viewing Pending Jobs” for more information.

Usage of the at command can be restricted. For more information, refer to Section 35.2.5, “Controlling Access to At and Batch” for details.


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