How to merge multiple PDFs in Ubuntu

Today I had to merge multiple PDFs into a single PDF and had no clue on how to do it. It was fairly easy to find out how to do it and I decided to share it. First you have to install two programs
sudo apt-get install gs
sudo apt-get install pdftk
Then you just have two open a console and run the following command
gs -dNOPAUSE -sDEVICE=pdfwrite -sOUTPUTFILE=resulting_file.pdf -dBATCH file1.pdf file2.pdf file3.pdf
And that's just it. You can change the final document's name from "resulting_file.pdf" to whatever you want and add as many files as you want to be merged into a single PDF.

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