Printing multiple files from the right-click context menu in Nautilus

If you want print files without open them, you can use nautilus scripting.
You can use your printer or a pdf printer (sudo apt-get install cups-pdf)

Go to ~/.local/share/nautilus/scripts
Create a new file and call it "printer.sh"

1. #!/bin/bash
   #
   # pdf-printer.sh
   #
   # Print files from the right-click context menu in Nautilus.
   # Place this script in ~/.local/share/nautilus/scripts.
   # The printer to use (as shown in the Printer Configuration
   # gui or in /etc/cups/printers.conf).
   printer=HP-LaserJet-P2055
   echo "$NAUTILUS_SCRIPT_SELECTED_FILE_PATHS" | while read file
       do
           lpr -P "$printer" "$file"
   done
   exit 0

In printer value, you can choose your favorite one with the same name that you see in your printers.

Now give execution permission to the file (chmod +x printer.sh) and restart nautilus.
If you click on a document, now you can see it as follows (In my case I created 2 printers):