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In my adventures with disown, I also discovered that in zsh, program &! starts and immediately backgrounds and disowns the program, so you can close the shell without the program getting a SIGHUP.

Other online sources said &| does this. My crude tests found no difference.

How do &! and &| differ?

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Turns out they really are equivalent, according to man zshbuiltins (section "disown"): simply syntactic alternatives for the same operation.

Anticlimactic…

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