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I/O redirection is used in shell scripting. This feature enables one to take the output of a command and redirect it as an input for another command, or a command can take the input from a file instead of from the standard input stream or from the terminal. The whole process helps connect data streams in various ways.

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Here are three things you can do with process substitution that are impossible otherwise. Multiple process inputs diff <(cd /foo/bar/; ls) <(cd /foo/baz; ls) There simply is no way to do this with …
answered Dec 21 '11 by tylerl