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by oguz-ismail 660 days ago
It's not. See https://pubs.opengroup.org/onlinepubs/9799919799/utilities/s...

    Applications should note that the standard PATH to the shell cannot be assumed to be either /bin/sh or /usr/bin/sh, and should be determined by interrogation of the PATH returned by getconf PATH, ensuring that the returned pathname is an absolute pathname and not a shell built-in.