Package at

Job spooling tools

http://ftp.debian.org/debian/pool/main/a/at

At and batch read commands from standard input or from a specified
file. At allows you to specify that a command will be run at a
particular time. Batch will execute commands when the system load
levels drop to a particular level. Both commands use user's shell.

You should install the at package if you need a utility for
time-oriented job control. Note: If it is a recurring job that will
need to be repeated at the same time every day/week, etc. you should
use crontab instead.

General Commands (Section 1)
at
at and batch read commands from standard input or a specified file which are to be executed at a later time, using /bin/sh.
File Formats (Section 5)
at.allow
The /etc/at.allow and /etc/at.deny files determine which user can submit commands for later execution via at(1) or batch(1). The format of the files is a list...
System Administration (Section 8)
atd
atd runs jobs queued by at(1).
atrun
atrun runs jobs queued by at(1). It is a shell script invoking /usr/sbin/atd with the -s option, and is provided for backward compatibility with older...