This is just a quick shout out to a useful set of functions available from the command line if you need to work with PDFs. I needed to rotate a 100+ pdf document, page by page, and was considering cyanide at the thought of point and click through a gui for that many iterations! [PDFtk](http://www.pdflabs.com/docs/pdftk-cli-examples/) hit it in a one liner!
`pdftk in.pdf cat 1-endS output out.pdf`
done. It also bursts, encrypts, etc. Nice addition to the tool box.