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並前往https://stackoverflow.com/questions/14066992/what-does-minus-mean-in-exec-3-and-how-do-i-use-it

What does minus mean in "exec 3>&-" and how do I use it?

2>&1 means that stderr is redirected to stdout; 3>&- means that file descriptor 3, opened for writing(same as stdout), is closed.

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