libharu-2.2.1.tar.gz disappears

Overnight, my project's build suddenly failed. The makefile is supposed to download and rebuild the libharu pdf generation library whenever it creates a clean build. It turned out that the libharu project has moved all its files on to Github and this much-used stable release has not been tagged.

Luckily I found a mirror under the Fedora project's repository - thanks Fedora!

Munging PDF files and pages

Having scanned over a dozen handwritten pages from my notebook into a PDF file, I had to invert every other page to make it possible to read the whole thing. It took me a while to find the answer, but YOU can go straight to the solution!

The command line is

pdftk.exe scannedfile.pdf cat 1 2S 3 4S 5 6S 7 8S 9 10S 11 12S output readablefile.pdf