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info chown is clear on that: Some older scripts may still use `.' in place of the `:' separator. POSIX 1003.1-2001 (*note Standards conformance::) does not require support for that, but for backward compatibility GNU `chown' supports `.' so long as no ambiguity results. New scripts should avoid the use of `.' because it is not portable, and because it has ...


Most tools are useful to someone. Here's a question from someone who wants to use factor to help divide up a large file into optimally-sized chunks. Find a "moderately large" divisor of a given number?

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