Subject:   -71- Why would I want to use 'lpr' instead of or as well as
                'lp'?
Date: 25 Jul 1995 00:00:01 EST

  IRIX is based on System V Unix and as such uses the 'lp' printing
  protocol. The appropriate software is installed by default and is
  sufficient (and preferred) for printing to local printers, printing
  to network printers attached to SGIs or other machines using the 'lp'
  protocol, and acting as a print server to machines using the 'lp'
  protocol.

  'lpr' is the BSD Unix printing protocol. (It is also referred to as
  the 'lpd' protocol, after the name of the spooler daemon.) SGI
  provides and supports it for printing to network printers attached to
  computers using only the 'lpr' protocol (e.g. a BSD Unix machine, an
  HP printer with an appropriately configured JetDirect card or a
  Macintosh running lpDaemon). It can also be used, unofficially, for
  printing to local printers (in one of several ways; see below) and
  acting as a print server to machines which understand only the 'lpr'
  protocol, of which there are many. The only reason for your SGI to
  use 'lpr' for a local printer is to allow it to act as an 'lpr' print
  server. Furthermore, in IRIX 5.3, the 'lp' print server ('lpsched')
  responds transparently to 'lpr' requests from remote machines, so you
  shouldn't need to configure a local printer for 'lpr' at all.