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Merge all pdf files in the directory into one pdf file (the out.pdf file)
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The `ls *.pdf` and be replaced by a simple *.pdf
This certainly works, no doubt. This is also possible with pdftk, the pdf toolkit, which under ubuntu/debian is installable as package name 'pdftk'. See the website: http://www.accesspdf.com/pdftk/ Unfortunately it requires nearly 10MB of other java packages. Internally, it very well might use ghostscript as you are showing, but it's command line is simpler to use. The pdftk version of this command would then be:
pdftk *.pdf cat output out.pdfAny advice on using this command to collate 2 pdf's? I often need to scan two-sided documents, but the scanner doesn't directly support it, so I'm always left with 2 pdf's, each containing every other page of the document.
pdfjoin --outfile out.pdf *.pdf