To combine two or more .PDF files, one can use "pdfunite" application, which is installed in Ubuntu Linux by default.
To combine n number of files,
pdfunite file1.pdf file2.pdf file3.pdf outfile.pdf
Running this command will combine all the files in to the outfile named outfile.pdf.
To combine n number of files,
pdfunite file1.pdf file2.pdf file3.pdf outfile.pdf
Running this command will combine all the files in to the outfile named outfile.pdf.
