atrun —
run jobs queued for later execution
atrun runs jobs queued by
  at(1). Root's
  crontab(5) must contain the
  line:
*/10	*	*	*	*	/usr/libexec/atrun
 
so that atrun gets called every ten
    minutes.
At every invocation, every job in lowercase queues whose starting
    time has passed is started. A maximum of one batch job (denoted by uppercase
    queues) is started each time atrun is invoked.
  - -lload_avg
- Specifies a limiting load factor, over which batch jobs should not be run,
      instead of the compiled-in value of 1.5.
- -d
- Debug; print error messages to standard error instead of using
      syslog(3).
Foratrun to work, a
  cron(8) daemon needs to be
  running.
  - /var/at/spool
- Directory containing output spool files
- /var/at/jobs
- Directory containing job files
The functionality ofatrun should be merged into
  cron(8).