# phpman > man > AT.ALLOW(5)

[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 submit 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  permit‐
       ted.

       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 username 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)