If you've used the command line much at all you know about I/O redirection
for redirecting input to and/or output from a program.
What you don't see all that often or that you may not be familiar
with is redirecting I/O inside a bash script.
And I'm not talking about redirections that you use when
your script executes another command, I'm talking about redirecting
your script's I/O once it has already started executing.