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lang-bash
exitwill be more efficient thantrue, sinceexitis builtin to the shell, buttruewill need to spawn a process. Even quicker would be a simple no-op (:) !trueis a built-in in all modern Bourne-like shells includingbash, just like:andexit(well those are special builtins, but that makes no difference in that regard). Andtrueandfalseare the commands to express boolean values there.man builtinsdoes not includetruein the synopsis at the beginning of the page, or anywhere else. OTOH,type truedoes indicate that it is a shell builtin. Maybe a documentation bug.man bashalso does not documenttrue.