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.\"     @(#)lpc.8	8.5 (Berkeley) 4/28/95
.\" $FreeBSD$
.\"
.Dd June 15, 2002
.Dt LPC 8
.Os
.Sh NAME
.Nm lpc
.Nd line printer control program
.Sh SYNOPSIS
.Nm
.Op Ar command Op Ar argument ...
.Sh DESCRIPTION
.Nm Lpc
is used by the system administrator to control the
operation of the line printer system.
For each line printer configured in
.Pa /etc/printcap ,
.Nm
may be used to:
.Bl -bullet -offset indent
.It
disable or enable a printer,
.It
disable or enable a printer's spooling queue,
.It
rearrange the order of jobs in a spooling queue,
.It
find the status of printers, and their associated
spooling queues and printer daemons,
.It
change the status message for printer queues (the status message
may be seen by users as part of the output of the
.Xr lpq 1 utility).
.El
.Pp
Without any arguments,
.Nm
will prompt for commands from the standard input.
If arguments are supplied,
.Nm
interprets the first argument as a command and the remaining
arguments as parameters to the command.
The standard input
may be redirected causing
.Nm
to read commands from file.
Commands may be abbreviated;
the following is the list of recognized commands.
.Pp
.Bl -tag -width indent -compact
.It Ic \&? Op Ar command ...
.It Ic help Op Ar command ...
Print a short description of each command specified in the argument list,
or, if no argument is given, a list of the recognized commands.
.Pp
.It Ic abort Brq Cm all | Ar printer
Terminate an active spooling daemon on the local host immediately and
then disable printing (preventing new daemons from being started by
.Xr lpr 1 )
for the specified printers.
.Pp
.It Ic clean Brq Cm all | Ar printer
Remove any temporary files, data files, and control files that cannot
be printed (i.e., do not form a complete printer job)
from the specified printer queue(s) on the local machine.
This command will also look for
.Pa core
files in spool directory
for each printer queue, and list any that are found.
It will not remove any
.Pa core
files.
See also the
.Ic tclean
command.
.Pp
.It Ic disable Brq Cm all | Ar printer
Turn the specified printer queues off.
This prevents new
printer jobs from being entered into the queue by
.Xr lpr 1 .
.Pp
.It Ic down Bro Cm all | Ar printer ... Brc Cm -msg Ar message ...
.It Ic down Bro Cm all | Ar printer Brc Ar message ...
Turn the specified printer queue off, disable printing and put
.Ar message
in the printer status file.
When specifying more than one printer queue, the
.Ic -msg
argument is required to separate the list of printers from the text
that will be the new status message.
The message doesn't need to be quoted, the
remaining arguments are treated like
.Xr echo 1 .
This is normally used to take a printer down, and let other users
find out why it is down (the
.Xr lpq 1
utility will indicate that the printer is down and will print the
status message).
.Pp
.It Ic enable Brq Cm all | Ar printer
Enable spooling on the local queue for the listed printers.
This will allow
.Xr lpr 1
to put new jobs in the spool queue.
.Pp
.It Ic exit
.It Ic quit
Exit from
.Nm .
.Pp
.It Ic restart Brq Cm all | Ar printer
Attempt to start a new printer daemon.
This is useful when some abnormal condition causes the daemon to
die unexpectedly, leaving jobs in the queue.
.Xr lpq 1
will report that there is no daemon present when this condition occurs.
If the user is the super-user,
try to abort the current daemon first (i.e., kill and restart a stuck daemon).
.Pp
.It Ic setstatus Bro Cm all | Ar printer Brc Cm -msg Ar message ...
Set the status message for the specified printers.
The
.Ic -msg
argument is required to separate the list of printers from the text
that will be the new status message.
This is normally used to change the status message when the printer
queue is no longer active after printing has been disabled, and you
want to change what users will see in the output of the
.Xr lpq 1 utility.
.Pp
.It Ic start Brq Cm all | Ar printer
Enable printing and start a spooling daemon for the listed printers.
.Pp
.It Ic status Brq Cm all | Ar printer
Display the status of daemons and queues on the local machine.
.Pp
.It Ic stop Brq Cm all | Ar printer
Stop a spooling daemon after the current job completes and disable
printing.
.Pp
.It Ic tclean Brq Cm all | Ar printer
This will do a test-run of the
.Ic clean
command.
All the same checking is done, but the command will only print out
messages saying what a similar
.Ic clean
command would do if the user typed it in.
It will not remove any files.
Note that the
.Ic clean
command is a privileged command, while the
.Ic tclean
command is not restricted.
.Pp
.It Ic topq Ar printer Xo
.Op Ar jobnum ...
.Op Ar user ...
.Xc
Place the jobs in the order listed at the top of the printer queue.
.Pp
.It Ic up Brq Cm all | Ar printer
Enable everything and start a new printer daemon.
Undoes the effects of
.Ic down .
.El
.Sh FILES
.Bl -tag -width /var/spool/*/lockx -compact
.It Pa /etc/printcap
printer description file
.It Pa /var/spool/*
spool directories
.It Pa /var/spool/*/lock
lock file for queue control
.El
.Sh SEE ALSO
.Xr lpq 1 ,
.Xr lpr 1 ,
.Xr lprm 1 ,
.Xr printcap 5 ,
.Xr chkprintcap 8 ,
.Xr lpd 8
.Sh DIAGNOSTICS
.Bl -diag
.It "?Ambiguous command"
abbreviation matches more than one command
.It "?Invalid command"
no match was found
.It "?Privileged command"
you must be a member of group "operator" or root to execute this command
.El
.Sh HISTORY
The
.Nm
command appeared in
.Bx 4.2 .