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lang-bash
sleep 3 ; read -t0 ; echo $?, and type something during those 3 seconds, there's1echoed. The same if I type nothing. I mean something likeaaa. Only if I type eitherCTRL-DorENTERafter thataaa, there's0echoed. Is this the expected behavior?read -t0does actually do aselect(). In zsh, you'd use thezselectbuiltin instead (zselect -r0 -r0).bash'sread -t0does aselect()to check whether there's any input, but, like mksh's, and unlike ksh93's or zsh's does not read() it regardless of whetherselect()says there is or not, so it can be used here. In the case of bash, it's documented, not in as many words in the case of mksh, so it may be unintentional there.