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lang-bash
=?(( ... ))is standardized in POSIX, but I haven't found a description of Bourne shell features and doubt that it works in the Bourne shell. I'll leave it up to OP to look it up or otherwise confirm this. You are right that the issue with unquoted variables has to do with something, and my point is that it is an issue. Again you are right thattestallows string comparison with=. Not so with arithmetic comparison, thoug, where-eqis required.(( ... ))(arithmetic evaluation) is an extension to the POSIX standard. BTW, the standard is available here. You text currently says that "All operators ... are words with dashes" and that=(and&&) should not be used.