A blog about system administration. Articles about Linux, Windows, NetApp storage and virtualization.
Print server on Linux (Common UNIX Printing System)
03 november 2016, 23:08
Good time readers of my blog and visit. Today, I want to make a quick note about the printing system of Linux to enter in the swing of things and prepare you for the next article on the print server with SAMBA.
So historically, Linux had 2 of the printing system LPRng and BSD LPD. These systems gradually become obsolete and are replaced by CUPS print system which is designed as a replacement for the above systems and which is much broader. When using the GUI interface GNOME, KDE or other managing printers with CUPS is no more difficult than Windows. In the article I will focus on work in console mode and GUI tools to consider practically will not Ctrl+P print in the GUI is available on all keyboards and are working the same in Windows and Linux . I note only that when using the graphical shell run the same commands that we will examine next.
We all know that when the printing works without a hitch then sending the print file, you can forget about it until the leaves come out on the printer. But if the seal is broken it is necessary to understand the principle of work to fix the problem.
In Linux only the root user has a direct access to the devices in our case - to the printer the other users operating system does not allow to apply directly to the physical devices to avoid conflict situations. Instead, utilities are turning to background system processes which put the job in the print queue. In addition, these processes convert the contents of the source files preparing them for output on a particular printer. For this purpose, the language of the printer and sharing protocols on the basis of which is set to print page is formed, if necessary oberaltenallee headers and footers numbered pages.
The printing system for Linux is under the control of the demon cupsd which has all the necessary privileges to access printers on behalf of the user. This daemon is automatically loaded at startup and configures a Linux system for the correct operation of the press. All the necessary parameters the daemon takes from the catalog etccups.
In Linux where you install CUPS for printing there are two main methods. The basis of the first lie lpr and lp in newer versions of CUPS. Which as argument take the name of the print file and send it to print to the default printer. These teams are the bridge to the second printing method. The basis of the second method are calls to the system call CUPS. Application using this method can not only send cupsd information but also to get the demon information about the capabilities of a printer. In response to this request returns the CUPS to the application file in the format of PPD PostScript Printer
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