Ho to clear a MQ queue :

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LEARN ABOUT MOJAVE

lpc

lpc(8)								    Apple Inc.								    lpc(8)

NAME

       lpc - line printer control program

SYNOPSIS

       lpc [ command [ parameter(s) ] ]

DESCRIPTION

       lpc provides limited control over printer and class queues provided by CUPS. It can also be used to query the state of queues.

       If no command is specified on the command-line, lpc displays a prompt and accepts commands from the standard input.

   COMMANDS
       The lpc program accepts a subset of commands accepted by the Berkeley lpc program of the same name:

       exit Exits the command interpreter.

       help [command]

       ? [command]
	    Displays a short help message.

       quit Exits the command interpreter.

       status [queue]
	    Displays the status of one or more printer or class queues.

NOTES

       Since  lpc  is  geared  towards	the Berkeley printing system, it is impossible to use lpc to configure printer or class queues provided by
       CUPS.  To configure printer or class queues you must use the lpadmin(8) command or another CUPS-compatible client with that functionality.

SEE ALSO

       cancel(1), cupsaccept(8), cupsenable(8), lp(1), lpadmin(8), lpr(1), lprm(1), lpstat(1), CUPS Online Help (http://localhost:631/help)

COPYRIGHT

       Copyright (C) 2007-2017 by Apple Inc.

11 June 2014							       CUPS								    lpc(8)

UNIX for Advanced & Expert Users