CUPS: Usage

Some basic commands that enable us to print and maintain our CUPS server and printers

• lpq -a - Shows the queued jobs for all printers.
• lpq -Pprintername - Shows the queued jobs for a specific printer.
• lprm X - Deletes a specific print job.
• lprm - - Deletes all print jobs.
• lpr - Send a file to printer.
• lpr -Pprintername - Send a file to a non default printer.
• lpc status all - Shows the state of the printers.
• lpmove # printer - Move a specific job to an other printer
• lpmove printer1 printer2 - Move all jobs from one printer to an other.
• cupsaccept - Enable the printing queue.
• cupsreject - Disable the printing queue.
• cupsenable - Enable the printer.
• cupsdisable - Disable the printer, will still send to queue.
• cupsdisable -r XXXX - Disable the printer with a reason.

Dennis.

CUPS: 426 Upgrade Required

After installing cups on my CentOS server, I noticed that when trying to add a printer I encountered an error that said "426 Upgrade Required".

As you'll probably notice, the new address that is supplied for you contains https://, incase you don't want to use SSL certification you can disable it by adding a line to /etc/cups/cupsd.conf :

DefaultEncryption Never

Dennis.

CUPS: Web GUI

In order to access cups web GUI from an other computer, there is a need to edit /etc/cups/cupsd.conf:


# Only listen for connections from the local machine.
Listen localhost:631 # You can configure wich interface to listen to
Listen /var/run/cups/cups.sock

# Restrict access to the server...
<Location />
  Order allow,deny
  Allow 192.168.1.0/24 # Add this line and specify your network/hostname or ip.
</Location>

# Restrict access to the admin pages...
<Location /admin>
  Order allow,deny
  Allow 192.168.1.0/24 # Add this line and specify your network/hostname or ip.
</Location>

Dennis.

Vim Enhancement

In order to make our code or configuration files more readable, we can color and number the lines and the syntax by doing the following :
1. Open your terminal window
2. Create a file named .vimrc in your home folder
3. In the file add the following lines

syntax on

set number

4. Done !

Dennis.