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PAUSE

If they want to quit, do so

GO

        INPUT FILE                    PRINTING COMMANDS

        __________                                        

       |   text   |                         cat   

       |    in    |                         pr    

       |     a    |--------------------->   pg    

       |   file   |                         nroff 

       |__________|                                       

A printing program takes its input from a file ...

        INPUT FILE                    PRINTING COMMANDS

        __________                                        

       |   text   |                         cat           

       |    in    |                         pr            

       |     a    |--------------------->   pg          

       |   file   |                         nroff         

       |__________|                                       

 ... and sends its output

 to one of three places:

        INPUT FILE                    PRINTING COMMANDS

        __________                             

       |   text   |                         cat

       |    in    |                         pr

       |     a    |--------------------->   pg  

       |   file   |                         nroff

       |__________|                           |               

                                              |               

             _________________________________|               

             |                                         ------

             |                                        | text |

       _____\/______          ----------              | text |

      /___________/ |        |          |           __| text |____   

     |            | |        |  Output  |         /   |______|  / |

     |  Terminal  | |        |   File   |        ---------------  |

     |            | |        |          |        |             |  |

     |------------| |        |          |        |   Printer   |  |

    /_____________/ /         ----------         |             | /

    |_____________|/                              ------------- 

                             OUTPUT DEVICES

 a terminal:               

        INPUT FILE                    PRINTING COMMANDS

        __________                             

       |   text   |                         cat

       |    in    |                         pr

       |     a    |--------------------->   pg  

       |   file   |                         nroff

       |__________|                           |

                                              |

                                   ------------

                                   |                   ------

                                   |                  | text |

       _____________          ----\/----              | text |

      /___________/ |        |          |           __| text |____   

     |            | |        |  Output  |         /   |______|  / |

     |  Terminal  | |        |   File   |        ---------------  |

     |            | |        |          |        |             |  |

     |------------| |        |          |        |   Printer   |  |

    /_____________/ /         ----------         |             | /

    |_____________|/                              ------------- 

                             OUTPUT DEVICES

 a file:                      

        INPUT FILE                    PRINTING COMMANDS

        __________                             

       |   text   |                         cat

       |    in    |                         pr

       |     a    |--------------------->   pg  

       |   file   |                         nroff

       |__________|                           |                      

                                              |

                                              |                      

                                              |        ------ 

                                              |       | text |

       _____________          ----------      |       | text |

      /___________/ |        |          |     |     __| text |____    

     |            | |        |  Output  |     |   /   |______|  / |

     |  Terminal  | |        |   File   |     |  ---------------  |

     |            | |        |          |     |  |             |  |

     |------------| |        |          |      ->|   Printer   |  |

    /_____________/ /         ----------         |             | / 

    |_____________|/                              -------------    

                             OUTPUT DEVICES

 or a printer: