Redirection by the user

---

In order to read a real file we have to wait for a later chapter or you can ask 
the user of the script to use redirection on the command line.

The user of out program might do the following to redirect the input
and/or the output of our program.

myperl.pl < in.txt
myperl.pl > out.txt
myperl.pl < in.txt  > out.txt