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lang-bash
foo=$baris one of the cases where double-quoting is not necessary. (bar e.g. some earlier buggy cases with Certain Shells.)unset? Would this be a POSIX shell?unset. The problem is,/bin/shon several of the most popular surviving proprietary Unixes isn't POSIX compliant -- its behavior was intentionally frozen without the changes required by Unix95. And since/bin/shis the only shell that is guaranteed to exist, and the one run bysystemand similar...shon AIX has no issue with itsunsetAFAIK. Only the old SunOSshon Solaris is documented to not be able to unsetIFS(orPATH, orMAILCHECKor the prompt variables). macOSshisbash, so there should be no issue there.