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atd - Man Page

run jobs queued for later execution


atd [-l load_avg] [-b batch_interval] [-d] [-f] [-n] [-s]


atd runs jobs queued by at(1).



Specifies a limiting load factor, over which batch jobs should not be run, instead of the compile-time choice of 0.8. For an SMP system with n CPUs, you will probably want to set this higher than n-1.


Specify the minimum interval in seconds between the start of two batch jobs (60 default).


Debug; print error messages to standard error instead of using syslog(3). This option also implies -f.


Run atd in the foreground.


Process the at/batch queue only once. This is primarily of use for compatibility with old versions of at;


Append the hostname of the system to the subject of the e-mails sent by atd.

atd -s

is equivalent to the old atrun command.


atd won't work if its spool directory is mounted via NFS even if no_root_squash is set.


/var/spool/at The directory for storing jobs; this should be mode 700, owner root.

/var/spool/at/spool The directory for storing output; this should be mode 700, owner root.

/etc/at.allow, /etc/at.deny determine who can use the at system.

See Also

at(1), at.deny(5), at.allow(5), cron(8), crontab(1), syslog(3).


The functionality of atd should be merged into cron(8).

Referenced By

at(1), at.allow(5), atrun(8).