/etc/at.deny files can be used to restrict access to the
batch commands. The format of both access control files is one username on each line. Whitespace is not permitted in either file. The
at daemon (
atd) does not have to be restarted if the access control files are modified. The access control files are read each time a user tries to execute the
The root user can always execute
batch commands, regardless of the access control files.
If the file
at.allow exists, only users listed in it are allowed to use
batch, and the
at.deny file is ignored.
at.allow does not exist, users listed in
at.deny are not allowed to use