The line-printer system consists mainly of the following files and commands:
Figure 1. Printing with the lpr utilities.- lpd
- Printer daemon that does all the real work.
- lpr
- Program to enter a job in a printer queue.
- lprq
- Spooling queue examination program.
- lprrm
- Program to delete jobs from a queue.
- lprc
- Program to administer printers and spooling queues; only root can use this utility.
- /etc/printcap
- A master database that describes printers directly attached to a machine and printers accessible across a network. It describes the available printers and how to communicate with them, and it specifies the values for important items (e.g., the spooling directory).