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[command]#at# and [command]#batch# Command Line Options
|Option|Description
|[option]`-f`|Read the commands or shell script from a file instead of specifying them at the prompt.
|[option]`-m`|Send email to the user when the job has been completed.
|[option]`-v`|Display the time that the job is executed.
Controlling Access to At and Batch
You can restrict the access to the [command]#at# and [command]#batch# commands using the `/etc/at.allow` and `/etc/at.deny` files. These access control files use the same format defining one user name on each line. Mind that no whitespace are permitted in either file.
If the file `at.allow` exists, only users listed in the file are allowed to use [command]#at# or [command]#batch#, and the `at.deny` file is ignored.
If `at.allow` does not exist, users listed in `at.deny` are not allowed to use [command]#at# or [command]#batch#.
The [command]#at# daemon ([command]#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 [command]#at# or [command]#batch# commands.
The `root` user can always execute [command]#at# and [command]#batch# commands, regardless of the content of the access control files.
Additional Resources
indexterm:[cron,additional resources]indexterm:[at,additional resources]indexterm:[batch,additional resources] To learn more about configuring automated tasks, see the following installed documentation:
`cron(8)` man page contains an overview of cron.
`crontab` man pages in sections 1 and 5:
The manual page in section 1 contains an overview of the `crontab` file.
The man page in section 5 contains the format for the file and some example entries.
`anacron(8)` manual page contains an overview of anacron.
`anacrontab(5)` manual page contains an overview of the `anacrontab` file.
`run-parts(4)` manual page contains an overview of the [command]#run-parts# script.
`/usr/share/doc/at/timespec` contains detailed information about the time values that can be used in cron job definitions.
`at` manual page contains descriptions of [command]#at# and [command]#batch# and their command line options.