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(1) In operating system shells, redirection refers to directing input and output to files and devices other than the default I/O devices. By default, input generally comes from the keyboard or mouse, and output goes to the display monitor. With a redirection operator, you can override these defaults so that a command or program takes input from some other device and sends output to a different device.

In DOS and UNIX systems, the redirection operators are < for input and > for output. For example, the DOS command

sort < c:\list > c:\sorted

takes input from a file called list, sorts it, and sends output to a file called sorted.

(2) See meta refresh.

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