# phpman > info > AT.ALLOW

[AT.ALLOW(5)](https://www.chedong.com/phpMan.php/man/AT.ALLOW/5/markdown)                Linux Programmer's Manual               [AT.ALLOW(5)](https://www.chedong.com/phpMan.php/man/AT.ALLOW/5/markdown)

NAME
       at.allow, at.deny - determine who can submit jobs via at or batch

DESCRIPTION
       The  /etc/at.allow and /etc/at.deny files determine which user can sub-
       mit commands for later execution via [at(1)](https://www.chedong.com/phpMan.php/man/at/1/markdown) or [batch(1)](https://www.chedong.com/phpMan.php/man/batch/1/markdown).

       The format of the files is a list  of  usernames,  one  on  each  line.
       Whitespace is not permitted.

       If  the  file  /etc/at.allow exists, only usernames mentioned in it are
       allowed to use at.

       If /etc/at.allow does not exist, /etc/at.deny is checked,  every  user-
       name not mentioned in it is then allowed to use at.

       An empty /etc/at.deny means that every user may use at.

       If neither exists, only the superuser is allowed to use at.

SEE ALSO
       [at(1)](https://www.chedong.com/phpMan.php/man/at/1/markdown), [cron(8)](https://www.chedong.com/phpMan.php/man/cron/8/markdown), [crontab(1)](https://www.chedong.com/phpMan.php/man/crontab/1/markdown), [atd(8)](https://www.chedong.com/phpMan.php/man/atd/8/markdown).

                                   Sep 1997                        [AT.ALLOW(5)](https://www.chedong.com/phpMan.php/man/AT.ALLOW/5/markdown)