I’m a big fan of hMailServer, but the documentation for setting up SSL certificates and the certification chain is a bit lacking. The easiest way to check if hMailServer is setup correctly is to use OpenSSL. openssl.exe s_client -showcerts -connect…
Category: Tips
1,500,000,000 the Epochening
Don’t forget that at 2:40am, 14 July 2017 (UTC) the Linux epoch will hit 1,500,000,000 (1.5 Gigaseconds). Visit https://www.john.geek.nz/epoch to watch the excitement! It hit 1,000,000,000 back in September 2001 and it won’t hit 2,000,000,000 until May 2033.
dump1090 binary built for Raspberry Pi / Arm
John
Posted in ADS-B Aircraft tracking, Embedded Systems, General Randomness, Linux Tips, Raspberry Pi
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If you’re after a binary of dump1090 for the Raspberry Pi without having to build it, here’s a compiled binary for you. I built it on Arch linux, but it also works on Raspbian, or likely any other Arm processor…
iPhone templates for UI prototypes
I’ve recently started doing a lot of development for the iPhone and iPad and I wanted to be able to sketch layouts on paper. Now it’s one thing to draw a rough iPhone layout, but it’s another to actually have…
Converting PDF files to HTML on Ubuntu
It’s very easy to convert PDFs to HTML on Ubuntu. The command is pdftohtml
Downloading routes from a GlobalSat DG-100 with gpsbabel on Linux
This is a GlobalSat DG-100 It’s an amazing piece of Kit, but the software that comes with it is absolutely rubbish. You can download all of the routes (and delete them from the unit) in one simple command with gpsbabel.…
Stopping Javascript from resizing the window in Firefox
One of my pet hates on the internet is shopping sites which resize the window when you’re looking at a zoomed in image. Not all of us still use a windowed browser, in fact, most people now use a tabbed…
Combining two images with ImageMagick
To combine two images of the same size with ImageMagick, you simply do the following: The following will overlay overlay.png on top of output.png mogrify -draw "image SrcOver 0,0 0,0 ‘overlay.png’" output.pngmogrify -draw "image SrcOver 0,0 0,0 ‘overlay.png’" output.png While…
Selective colour replacement with imagemagick
Selective colour replacement is easy from the command line with imagemagick. You can download imagemagick from http://www.imagemagick.org/ The following will replace all red (#FF0000) pixels with blue (#0000FF) convert sourceimage.png -fill "#FF0000" -opaque "#0000FF" destimage.pngconvert sourceimage.png -fill "#FF0000" -opaque "#0000FF"…
Deleting folders recursively
I needed recursively delete folders named .svn within a directory structure. The following will allow you dto do this from a command prompt: FOR /F "tokens=*" %G IN (‘DIR /B /AD /S .svn’) DO RMDIR /S /Q %GFOR /F "tokens=*"…
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