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lang-bash
trap - [SIG_SPEC]doesn't revert to previous trap, it reverts to "the value it had upon entrance to the shell". This could be blank, or inherited from the parent shell. It wil not revert to one you previously set in the current shell. There is no trap stack other than that created each time you spawn a subshell. In other words if you set a trap for a given SIG_SPEC and then set it again the first one is replaced by the second.func() ( … )) then?