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2011-01-30
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Plumber's tee for pipes.
Don Harbaugh 6/7/84
Tee is a program that gets characters from standard input, puts
them to standard output, and also puts them to the screen.
This may not sound like a useful program, but imagine this:
You are going to run a program called CRUNCH that takes 6 hours
to complete, and that puts more than a screenful of data to
standard output. You don't want to sit there for hours watching
the screen, and you don't have a printer, so you redirect the
standard output to a file, like this:
A>CRUNCH >LISTOUT
You start the program and return 6 hours later to find that
during the first 5 minutes of execution it suffered a fatal
error that you never saw because the standard output was
redirected to a file. You have wasted 6 hours.
Tee allows you to put standard output into a file, but also see
it on the screen. You use it like this:
A>CRUNCH | TEE >LISTOUT
DOS pipes the standard output of CRUNCH to the standard input of
Tee. Tee puts the characters to standard output, which you have
redirected to a file. Tee also displays the characters on the
screen, so that you can check things from time to time.
ed to a file. Tee also displays