[ct-user] Pipe vs redirection

[Robert Hummel <rhummel@cheshire.net> (Robert Hummel)]

Redirection is used to change where a program looks for its input or
output, from the DOS standard input device (STDIN) or standard output
device (STDOUT) to a file or a device.

For example, redirect a program that normally writes to STDOUT to a file:

        DIR > dirlist

Redirect a program's input from STDIN to a file.

        DEBUG <cmdlist

Do both:

        DEBUG <cmdlist >result

Piping connect one program's STDOUT to another's STDIN, with DOS creating,
managing, and deleting the temporary file used to store the output. This is
equivalent to the following.

        PROGRAM1 > temp
        PROGRAM2 < temp
        DEL temp



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