Many times in my career I have needed to merge several PDF files into a single PDF file. As for instance, the most common format of the PhD thesis in our department is that it begins with a comprehensive review (referred to as 'review of the literature') and continues with several published papers. While I was preparing my thesis I tested several opensource software in Ubuntu and many had problems such as reduced resolution. Eventually, the software that landed on was pdf toolkit (PDFtk) which I have happily been using it since. Here is a samples run to merge 3 files into a single mergedFile.pdf .
pdftk file1.pdf file2.pdf file3.pdf cat output mergedFile.pdf
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