I want to learn to use the shell and was wondering why this …

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著者: Kevin Buettner
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題目: I want to learn to use the shell and was wondering why this didn't do as expected

On Feb 20, 1:25pm, Michael Havens wrote:

> Why did my version (sort mypasswd >mypasswd |cat mypasswd) erase it?

Because the redirection operator opens and truncates the file. This
is done by the shell before the sort program even gets a chance to do
its own open() of the file.

Kevin

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