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It’s nice that firefox 3 can directly create pdfs (print, select print to file). However, while doing research and creating pdfs of articles, some were split in different pages (or needed additional information, like citation information). Here’s how to merge those pdfs from the command line:

$ gs -q -sPAPERSIZE=a4 -dNOPAUSE -dBATCH -sDEVICE=pdfwrite -sOutputFile=result.pdf input1.pdf input2.pdf input3.pdf

Change the PAPERSIZE value to “letter” if you live where the use that format. “result.pdf” is the result of merging “input1.pdf”, “input1.pdf” and “input1.pdf”. Change the values to fit your files.