Linux 2.6 - man page for atd (linux section 8)
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atd - run jobs queued for later execution
atd [-l load_avg] [-b batch_interval] [-d] [-f] [-s]
atd runs jobs queued by at(1).
-l Specifies a limiting load factor, over which batch jobs should not be run, instead
of the compile-time choice of 1.5. For an SMP system with n CPUs, you will proba-
bly want to set this higher than n-1.
-b Specify the minimum interval in seconds between the start of two batch jobs (60
-d Debug; print error messages to standard error instead of using syslog(3). This
option also implies -f.
-f Run atd in the foreground.
-s Process the at/batch queue only once. This is primarily of use for compatibility
with old versions of at; atd -s is equivalent to the old atrun command. A script
invoking atd -s is installed as /usr/sbin/atrun for backward compatibility.
atd won't work if its spool directory is mounted via NFS even if no_root_squash is set.
/var/spool/cron/atjobs The directory for storing jobs; this should be mode 700, owner dae-
/var/spool/cron/atspool The directory for storing output; this should be mode 700, owner
/etc/at.allow, /etc/at.deny determine who can use the at system.
at(1), atrun(1), cron(8), crontab(1), syslog(3), at.deny(5), at.allow(5).
The functionality of atd should be merged into cron(8).
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