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• Where Did It Go?

  To write low-level scripts, as an admin, you need to know whether you are currently on a physical or a virtual machine. Charly finds out with a couple of clever hacks.

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• Charly's Column – SparkFun

  Is your neighbor burning the wrong kind of wood or did a couple of VWs just pass by your house? Charly finds out with a sensor. For an attractive approach to visualizing boring measurement figures, you can either use your own web server or rely on a specialized service like SparkFun.

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• The sys admin's daily grind: DenyHosts

  When it comes to warding off unwanted login tests on SSH port 22 and others, Charly likes to keep an ace or two up his sleeve by relying on DenyHosts instead of Fail2ban.

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• Charly's Column – Doorbell Pi

  When Charly puts on his headphones at home, he often fails to hear the doorbell. So, he dreamed up a solution with a Raspberry Pi Zero, a noise detector, and a power outlet with a LAN connection.

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• Charly's Column – The Fuck

  In the 25 years of Linux kernel history, a huge amount of code and many comments have accumulated. They can be explanatory, enlightening, funny, or even profane. Charly prefers to do things differently, so he types fuck in the shell.

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