4. Pipes

This section explains in a very simple and practical way how to use pipes, nd why you may want it.

4.1 What they are and why you'll want to use them

Pipes let you use (very simple, I insist) the output of a program as the input of another one

4.2 Sample: simple pipe with sed

This is very simple way to use pipes.

        ls -l | sed -e "s/[aeio]/u/g"   
        

4.3 Sample: an alternative to ls -l *.txt

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$"