The LPR/LPD protocol was originally designed to send a print request from a workstation to a remote print server, not directly to a remote printer; therefore, once an LPR request has been started, it is not possible to interfere with it. Printer commands like forward-space or backspace, and file status check pointing are not supported. The only way you can check the status of your printout is by walking to the printer and checking to see if the expected physical pages have been successfully printed.
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