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This section explains in a very simple and practical way how to use pipes,
nd why you may want it.
Pipes let you use (very simple, I insist) the output of a program as the
input of another one
This is very simple way to use pipes.
ls -l | sed -e "s/[aeio]/u/g"
Here, the following happens: first the command ls -l is executed, and it's output,
instead of being printed, is sent (piped) to the sed program, which in turn, prints
what it has to.
Probably, this is a more difficult way to do ls -l *.txt, but it is here for illustrating pipes,
not for solving such listing dilema.
ls -l | grep "\.txt$"
Here, the output of the program ls -l is sent to the grep program, which, in turn, will print
lines which match the regex "\.txt$".
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