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Linux 101: Printing

To most users the system of printing on a PC is a simple, point-and-click process that should be automatically set up upon first use and does but one thing and one thing only - enables a PC to print. This is typically the case, and when printing with a Windows machine this system is often complimented by the installation of a piece of software written specifically for the printer to be used. Even if the printer was not set up and configure upon purchase, all the end user needs to do is insert the included CD (that came with the printer), install the software, plug in the printer, and begin printing.

With Linux this task may or may not be as simple. New Linux end users are often surprised to find out that, out of the box, many printers are already supported by their operating system. For those printers that are not supported out of the box, sometimes getting one to work is just a matter of finding the right driver to install. Sometimes, to the dismay of the user, their printer is not supported. Fortunately the latter scenario is becoming more and more rare.

But even with Linux printing becoming easier and easier to set up, it's always good for the new user to see how they can install their new printer on a Linux box and begin printing. Now, if you understand how many and varied the Linux flavors are, you will understand how imposing of a task it would be to cover all possible printer configuration systems. Fortunately the Common Unix Printer Service (CUPS) offers a web-based, universal set up tool that is found on all distributions that use CUPS for printing.

In this tutorial you will be introduced to CUPS and see how to setup a printer for a Linux desktop machine. 

CUPS

What is CUPS? CUPS is a modular printer system for the UNIX-like operating systems that serves as a print server. But don't think that a print server is a network-only system. The CUPS system can act as a printer server for a local machine or a network of machines. This means with one system you can set up printing for a local machine or for a group of networked machines.

CUPS consists of:

  • Print spooler/scheduler: Lines up printing jobs to be sent to the printer.
  • Filter system: Converts data so that the attached printer can understand and format the data being printed.
  • Backend system: Transports data from filters to printer.

Printing Flow

The flow of data looks like that shown in Figure 1. As you can see application (OpenOffice.org, Firefox, Evolution, Nano, etc.) sends its data to the scheduler, which then begins the CUPS process.

By default cups installs the following directories:

  • /etc/cups: Configuration directory.
  • /var/spool/cups/: The spooler directory where print jobs are held for printing.
  • /var/spool/cups-pdf: The spooler directory where CUPS-generated PDF files are held for printing.

CUPS also installs an executable binary in /etc/init.d/ (or /etc/rc.d/init.d) called cups. This binary is started with the command:

/etc/init.d/cups start

Stopped with the command:

/etc/init.d/cups stop

And restarted with the command:

/etc/init.d/cups restart

For the basic usage that is really all you would need to know. Of course the next step is to understand how to set up your printer. As I said earlier, because each distribution contains different tools for printer setup, I am going to demonstrate this process with the integrated CUPS web-based tool. This knowledge should easily translate over to your distributions' set up tools.

Printer Setup

When you set up a printer in UNIX, the configuration creates a Postscript Printer Description file (ppd). This file contains all of the descriptions of a printers' features as well as the PostScript code used to invoke features for a print job for that printer. A typical PPD file will look like this file for a Samsung ML-1710. This ppd file will be created no matter which setup tool you use. Most likely you will not have to touch this file. There  have been a few occasions where I have had to take care of a couple of very minor changes to this configuration file. Those are very rare instances however. 

Now, let's move on to the actual configuration.

CUPS main windowIn order to configure your printer with the CUPS web-based tool you need to open up your web browser and point it to http://localhost:631. What will appear is the main page for the CUPS web-based tool (see Figure 2). The set up of a printer is simple. Here are the steps:

  1. Click the Add Printer button.
  2. Enter the name, location, and description of the printer.
  3. Select the device.
  4. Enter the device URI (this instructs the backends where the printer is located).
  5. Select the Manufacturer of your printer.
  6. Select the Model of your printer.
  7. Configure any general settings for your ptiner.

That's it. Now let's examine each step more closely.

Step 1

From the main page click Add Printer button. You will also notice a Manage Printers button. From that screen you can manage all printers that have already been added.

Enter name information

Step 2

 

There are three pieces of information that you need to enter in this window (see Figure 3):

  • Name: This is the name of the printer that can not include the characters "#", "/", or a SPACE. In my case, for the Samsung ML-1710, I could enter SamsungML1710.
  • Location: This is a description where the printer is located. This is just for ease of management. And human-readable characters are valid.¬†
  • Description: A human-readable description of your printer. This can contain spaces.

Once you have filled out all of this information, click Continue to move to the next step.

Step 3

Device URIIn this window (see Figure 4) you are going to select the Device URI for the printer. This will most likely fall under one of two categories: local or remote. If the printer is local it will be listed in the drop down, so all you need to do is select that printer. If the printer is remote (as we are going to setup - since it is the more difficult process). Since I am going to illustrate using a remote printer, I will select the Internet Printing Protocol as my Device URI.

Once you have selected the proper URI click the Continue button to move on to the next step.

Step 4

Address of printerIn the next window (see Figure 5), since we are configuring a remote printer, you will need to enter the address of the printer. In the case of my remote printer I knew before hand that the printer in question was located in the /printers/ spool and was called LaserPrinter. If you are connecting to a printer server, you will need to know this information.

Obviously the CUPS system offers you examples of the types of URI addresses that are valid. Even though you have already instructed CUPS that you are using ipp (from the previous window), you still have to include the ipp:// section of the address for your remote printer. Without that your machine will not be able to connect to the remote printer.

After you have entered the address click Continue to move on to the next step.

Steps 5 and 6

In these two steps you only need to select the Manufacturer (Step 5) and the Model (Step 6) of your printer. Pay close attention when selecting your Model because there might be different selections for different languages. So choose the proper language. If you do not find your Model for your printer then you might have to install a driver for it. In my case (for the Samsung ML-1710) I had to go back and install the Splix driver. To do this I followed these steps:

  1. Open up Synaptic
  2. Search for "splix" (no quotes).
  3. Install the resulting application.

The SPLIX package is the driver package for Samsung SPL2 and SPLC laser printers.

If your printer is not a Samsung, and it does not appear in the Model selection, you might need to search for either a proprietary driver or a compatible driver. Google is your friend.

Further configuration optionsOnce you have completed this step you can click the Add Printer button to add your printer. Most likely you will be asked to enter your administrator username and password. When that authentication succeeds a new page will open up (see Figure 6) that allows you to further configure your printer. This page is really only necessary if you have specific needs from your printer. If you do not need to refine your configuration you can close out the CUPS web interface and begin using your printer.

Final Thoughts

Congratulations, you just set up your printer on a Linux machine. Of course this walk-through instructed you how to set up a remote printer. The reason for this is that the remote printer setup has a few more steps to complicate the issue, so knowing how to accomplish this will make configuring a local printer a snap.

And even if your distribution has a tool specific for printer configuration, you can still use the CUPS web-based interface for this job. In some ways this tool is much easier to use. 

 

 

 

 

 

 

 

 

Comments

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  • soup Said:

    Thanks , even though this is from 2010 all worked the same. Just a few extras... when asked user name and password when add printer is clicked it is asking for the the user that is setting up the printer and that password. CUPS will also 'find' available printers, like if you are at home with one printer and many computers, and make set up much less work. I say these things because as a noob myself little things explained make all the difference in Linux use. Thanks for the article.


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