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lang-bash
"$?". I see no reason to include the{and the}; do you have one?${?}are really needed in that case AFAIK.${?}in[[ "${?}" == "0" ]]because word splitting doesn't affect such variable in that specific case. I quoted it anyway because, as Stéphane Chazelas said in the question you linked, "omitting quotes [...] can send a wrong message to beginners: that it may be all right not to quote variables". For the record, I've also made an answer about some subtleties of word splitting.