Legacy printing (lpd)

  • Printers are assigned to queues, which are managed by lpd, the print daemon. lpd listens for inbound print requests, forking a copy of itself for each active print queue.

  • lpr submits jobs to print queues.

  • lpq queries and displays queue status.

  • lprm allows jobs to be removed from print queues.

  • lpc allows root to administer queues; it has both interactive and command-line forms.

  • Filters translate data formats into a printer definition language.

  • Spool directories hold spooled job data.

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