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    I always use xeyes(1) for testing X-forwarding. It’s cuter. Using it as an alarm never occurred to me, simple and good idea.

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      Want to know how big something on your screen is in pixels? Fire up an xlogo, line it up with one edge of the thing, resize until the opposite edge lines up too, and if your window manager puts up a tooltip during window resizing (which I think all the ones I’ve ever used do), then you know the size.

      I don’t think I’ve used a window manager that does this since the 90s…

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        I’ve always used xclock for this task. I especially like the nonstandard catclock mode.