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Portable Shell Programming

    The point of a standard isn't even whether it's ideal or particularly sensible,
    it's that a compliant program produces consistent results on compliant platforms.
    Diverging in the name of whatever benefit just means that one has to work harder
    to produce a portable program.
-- Richard L. Hamilton, in comp.unix.questions

2016-07-12 (see recent changes)

1. Books

2. POSIX / SUS (Single UNIX Specification), and implementations


3. Traditional portability, the unix landscape


<http://www.in-ulm.de/~mascheck/various/portability/>