为什么有一个 '.' 在重庆工作？

Question

为什么 GNUchown user.group有效？文档没有说明所支持的语法。背后有什么动人的故事吗？

Answer 1

info chown 很清楚：

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 undesirable
results if the entire OWNER`.'GROUP happens to identify a user whose
name contains `.'.

在GNU程序的情况下，通常不仅值得检查，man而且info页面也值得检查，因为GNU 人憎恶手册页（来自man tar）。