LPRng Reference Manual: 3 May 2004 (For LPRng-3.8.27)
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# 19.7. lprm Requests

The RFC1179 protocol specifies that lprm job removal requests can be sent to the lpd server. The lpq requests have the format:

        \005printer user [id]* \n

The lpd print server will search the specified print queue and remove any job whose ID, hostname, or user name information from the control file A, H, or P fields match any of the id values and for which the user has permission to perform a removal operation. See Permissions and Authentication for details.

Most RFC1179 compatible spoolers use the user information in the request as the name of the user which spooled the job. However, in a network environment this is extremely easy to fabricate, and is at best a weak type of authentication.

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