use `<' to redirect `stdin' (standard input) from a file
cat < ~/.bashrc #just like 'cat ~/.bashrc'
mail newbie < /.bashrc
use `>' to redirect `stdout' (standard output) to a file
in case you want to save the output, or look at it later, or if
the output is too much to fit on your screen.
ls /etc ; ls /etc > ectOutput
more etcOutput
(redirection also works similarly on tcsh)
we'll talk about pipes after we talk about basic unix utilities,
even though they are really part of the shell. Using a pipe is
redirection of the output from one program to the input to another.
