LPRng Reference Manual: 3 May 2004 (For LPRng-3.8.27)
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# 17.4. Example Permission File

        # allow root on server to control jobs
        ACCEPT SERVICE=C SERVER REMOTEUSER=root
        ACCEPT SERVICE=C LPC=lpd
        REJECT SERVICE=C
        #
        # allow same user on originating host to remove a job
        ACCEPT SERVICE=M SAMEHOST SAMEUSER
        # allow root on server to remove a job
        ACCEPT SERVICE=M SERVER REMOTEUSER=root
        REJECT SERVICE=M
        # all other operations allowed
        DEFAULT ACCEPT

In the above sample, we first specify that lpC commands from user root on the lpd server will be accepted. This is traditionally the way that most lpc commands operate. We also allow anybody to use the `lpc lpd` command. We reject any other lpc requests.

We accept lprM requests from the host and user that submitted the job, as well as from root on the server, and reject any others.

Finally, all other types of commands (lpq, lpr) are allowed by default.

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