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90s to early 2000s, it was "fun" to accidentally use "killall" on the wrong machine. System V derived UNIXes really mean "kill all", not what Linux meant with it ("kill all with a certain name"), and what today is better represented by "pkill" anyway.

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Also reboot, which is safe on Linux, but does an instant power cycle with no proper shutdown on others.

Good one. That as well, and the reason why I'm still first trying "shutdown -r now", and if that doesn't work cautiously type in "reboot --help" (hoping that it parses the argument and does nothing at first), even on busybox.

I know what you mean, but I still laughed at “cautiously type in ‹thing that doesn't care how cautiously you typed it if it's going to screw up›”

reboot and halt used to do the instant thing on Linux too, it was essentially a lot of drift and well meaning fixes for desktop users (because actually invoking emergency halt or reboot might have been more useful for remote machines that you couldn't power cycle with a finger)

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