System Administration Guide: Advanced Administration

ProcedureHow to Verify That at Command Access Is Denied

  1. To verify that a username was added correctly to the /etc/cron.d/at.deny file, use the at -l command while logged in as the user. If the user smith cannot access the at command, the following message is displayed:


    # su smith
    Password:
    $ at -l
    at: you are not authorized to use at.  Sorry.

    Likewise, if the user tries to submit an at job, the following message is displayed:


    $ at 2:30pm
    at: you are not authorized to use at.  Sorry.

    This message confirms that the user is listed in the at.deny file.

    If at command access is allowed, then the at -l command returns nothing.