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How to nuke a hard drive with Ubuntu live CD

When selling old hardware, for instance an old laptop or external hard drive, you want to make sure nobody can access your private traces and data that you left on the device. Even if you clear the trash bin of your computer, the data is not always gone and can be recovered. In fact, the data is marked as deleted but can still be accessed and restored using special software tools. The data will be removed ultimately only after it is overwritten by new data.

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Really, really add /usr/local/bin to the PATH variable on Mac OS X

Since Mac OS X El Capitan you cannot put any custom files under /usr/local/, even when you sudo as much as you can (so even with administrator rights). Therefore, you are forced to use /usr/local/bin for your custom executables. If you are using Homebrew to install certain executables on your system, the programmes will be installed under the path /usr/local/bin as well. However, the path /usr/local/ is not included in the system’s default PATH variable so you cannot e.g. use these executables from within your Java programmes.

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What the.. TeX? The basics about TeX and LaTeX

If you want to write an academic article or even an academic thesis for your bachelor, master or doctoral degree, you may have came across TeX or at least heard about it. TeX is a typeset language designed by Donald E. Knuth, who is famous in computer sciences for his books “The Art of Computer Programming”. He was so upset by typesetting systems in the 197os that he decided to work out a better typesetting system – TeX was born.

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