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並前往https://stackoverflow.com/questions/53319817/what-is-the-meaning-of-n-z-x-l-d-etc-in-shell-script

What is the meaning of -n, -z, -x, -L, -d, etc... in Shell Script ...

IMHO best way is you could simply do man test for all these details. It is very well explained there. As follows is the text from man page.

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