$ cat AtoF
Print only odd lines
sed -n 'p;n' AtoF
-n suppress automatic printing of pattern space, p print the current pattern space, n read/append the next line of input into the pattern space.
$ sed -n 1~2p AtoF
-n suppress automatic printing of pattern space, 1~2 from the 1st line match every line every 2 steps, p print the current pattern space. sed -n 0~p has the same effect . print only the even lines.
Print only even lines
$ sed -n 'n;p' AtoF
$ sed -n 2~2p AtoF
0~2p would also work. I prefer
You can use ImageMagick to convert multiple PNGs into a PDF and convert a multiple pages PDF into multiple PNGs.
PDF to PNG
$ convert document.pdf document.png
For a document with 10 pages, this will generate document-0.png, document-1.png, … document-9.png.
PNG to PDF
$ convert document*.png document.pdf
This convert the PNG pages into pages in the document.pdf document.
Openpixels is a project of mine to create a free and open source artistic framework for game projects in any language or platform. It is going pretty well.
You can just download a zip or tar.gz of the latest version.
You may want fork it or get a git working copy of it to later make your own contributions to the project. In this case:
apt-get install git-core
git clone git://github.com/silveira/openpixels.git
You will see something like this:
Cloning into openpixels...
remote: Counting objects: 129, done.
remote: Compressing objects: 100% (126/126), done.
remote: Total 129 (delta 17), reused 0 (delta 0)
Receiving objects: 100% (129/129), 784.52 KiB, done.
Resolving deltas: 100% (17/17), done.
And now you have a repository clone at ~/openpixels and you can start hacking.