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List:       lprng
Subject:    LPRng: New printcap facility: client.xxx and server.xxx selection
From:       Patrick Powell <papowell () astart ! com>
Date:       2002-07-18 15:58:06
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After much consideration, added the 'client.xxx' and 'server.xxx'
facility.  Briefly,  if you have a printcap entry of the form
client.xxx or server.xxx then this can be used to set the corresponding
xxx variable when the printcap entry is used by the lpd server or
the LPRng client programs lpr, lpq, lprm, checkpc, etc.

  Entry               Program Type          Sets
  server.xxx = vvv    lpd (server)          xxx = vvv
  client.xxx = vvv    lpr,lpq... (client)   xxx = vvv

The purpose of this enhancement is to allow a single printcap entry
to be used for both client and server operation, especially in
situations where the lpd server is forwarding or sending jobs to
another lpd queue.

Example of use:
  lp:
      # used by clients, forcess them to send to
      # specified server
    :lp=%P@server.hostname:force_localhost@
      # used by lpd server
      # the server will now send jobs to the
      # specified destination
    :server.lp=%P@destination

This is equivalent to and replaces the :client and :server
printcap flags, as shown below:

  lp:client
    :lp=%P@server.hostname:force_localhost@
  lp:server
    :lp=%P@destination

The selection operation also works with values in the
lpd.conf file, allowing global overrides for clients and
servers.  (I can't imagine a use for this,  but it is there
if somebody wants to use it.)

The lpc client and lpc server commands will display the
selected client.xxx and server.xxx values.  They are also
propagated to the PRINTCAP_ENTRY environment variables
for filters.

Patrick Powell                 Astart Technologies
papowell@astart.com            6741 Convoy Court
Network and System             San Diego, CA 92111
  Consulting                   858-874-6543 FAX 858-279-8424 
LPRng - Print Spooler (http://www.lprng.com)

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