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findis at least as problematic asrealpath. They are both defined in POSIX, butfindis known to have multiple, slightly incompatible implementations.realpathmay not be installed by default. At least it happens on one of my testing VMsfindis also resource intensive and potentially returns multiple results when there are more than one file with the same name. There are better options, like Python/Perl one-liners.realpathseems to be absent on macOS and some old Linux distros from a decade ago. Otherwise, it's provided bycoreutils,busybox, FreeBSD, NetBSD, OpenBSD.