Execute commands entered on standard input. If time is omitted, execute commands when the system load permits (when the load average falls below 0.8). Very similar to at, but does not insist that the execution time be entered on the command line. See at for details.
Read job from file, not standard input.
Mail user when job has completed, regardless of whether output was created.
Place job in queue denoted by letter, where letter is one letter from a-z or A-Z. The default queue is b. (The at queue defaults to a.) Higher-lettered queues run at a lower priority.
Print the version number and then exit.
Display the time a job will be executed.