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  “…I really don’t want to have to wipe the thing because it’s running a headless OS” I feel like logging in as root on a headless system and hoping you type the command(s) to restore functionality is a rite of passage.

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  I have heard, but have trouble finding references to it, that you can build a simple arbitrary waveform generator circuit by using an analog scope, a photodiode, and a cardboard cutout. You make a photodiode circuit that rails high with no light, but light on the photodiode pushes the signal low. Then you aim this at the phosphor screen with a cardboard cutout of the desired waveform: signal goes up until the phosphor trace is above the screen, and then it gets pushed low (i.e., feedback keeps...

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  nc is useful. For example: if you have a disk image downloaded on computer A but want to write it to an SD card on computer B, you can run something like user@B: nc -l 1234 | pv > /dev/$sdcard And user@A: nc B.local 1234 < /path/to/image.img (I may have syntax messed up–also don’t transfer sensitive information this way!) Similarly, no need to store a compressed file if you’re going to uncompress it as soon as you download it—just pipe wget or curl to tar or xz or whatever. I...

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  I'm really really glad that I get root on my work computer.