03-07-2002
A second explanation, not as detailed
For simple unix programmers like me, a daemon is just a process that runs in the background, usually waiting for something to happen that it is capable of working with, like a printer daemon is waiting for print commands.
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lpc(8) System Manager's Manual lpc(8)
Name
lpc - line printer control program
Syntax
/etc/lpc [ command [ argument... ] ]
Description
The program is used by the system administrator to control the operation of the line printer system. For each line printer with an entry
in the file, may be used to start/stop several different functions.
Without any arguments, prompts for commands from the standard input. If arguments are supplied, interprets the first argument as a command
and the remaining arguments as parameters to the command. The standard input may be redirected causing to read commands from file. The
commands and their parameters are shown below. Commands may be abbreviated.
? [ command... ]
help [ command... ]
Prints a short description of each command specified in the argument list, or, if no arguments are given, a list of the recognized
commands.
abort [ all ] [ printer... ]
Terminates an active spooling daemon on the local host immediately and then disables printing (preventing new daemons from being
started by for the specified printers.
clean [ all ] [ printer... ]
Removes all files beginning with ``cf'', ``tf'', or ``df'' from the specified printer queue(s) on the local machine.
enable [ all ] [ printer... ]
Enables spooling on the local queue for the listed printers. This will allow to put new jobs in the spool queue.
exit
quit
Exits from
disablefR [ all ] [ printer... ]
Turns off the specified printer queues. This prevents new printer jobs from being entered into the queue by
restart [ all ] [ printer... ]
Attempts to start a new printer daemon. This is useful when some abnormal condition causes the daemon to die unexpectedly leaving
jobs in the queue. The command will report that there is no daemon present when this condition occurs.
start [ all ] [ printer... ]
Enables printing and starts a spooling daemon for the listed printers. This command also creates an file in the printer's spool
directory. The file can be used by filters as an initialization flag.
status [ all ] [ printer... ]
Displays the status of daemons and queues on the local machine.
stop [ all ] [ printer... ]
Stops a spooling daemon after the current job completes and disables printing.
topq printer [ jobnum... ] [ user... ]
Places the jobs in the order listed at the top of the printer queue.
Diagnostics
?Ambiguous command
Abbreviation matches more than on command.
?Invalid command
No match was found.
?Privileged command
The command can only be executed by root.
Files
Printer description file
Spool directories
Lock file for queue control
See Also
lpq(1), lpr(1), lprm(1), printcap(5), lpd(8)
lpc(8)