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    ! is POSIX which nowadays is portable-enough. Even systems that still ship with the Bourne shell also have a POSIX sh somewhere else on the filesystem which you can use to interpret your standard syntax. Commented Dec 3, 2015 at 22:21
  • @StéphaneChazelas This is technically true but in my experience it is easier to rewrite a script in Perl than it is to deal with the hassle of locating and activating the POSIX-compliant shell environment starting from /bin/sh. Autoconf scripts do as you suggest, but I think we all know how little of an endorsement that is. Commented Dec 4, 2015 at 18:19