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Date: Thu, 29 Dec 2011 23:04:31 +1100
Subject: Re: Help in rotate 13 program
From: Chris Angelico <rosuav@gmail.com>
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Xref: x330-a1.tempe.blueboxinc.net comp.lang.python:18167

On Thu, Dec 29, 2011 at 10:48 PM, Sayantan Datta <kenzo.zombie@gmail.com> w=
rote:
> =A0 =A0 for line in sys.stdin :
> =A0 =A0 =A0 for char in line :
> sys.stdout.write(rotate13_letter(char))
>
> cat sample.html | python rot13.py rot13.html

You're reading from stdin, which is correct, but you're writing to
stdout and not redirecting it. You need to put an arrow before
rot13.html to indicate redirection:

cat sample.html | python rot13.py >rot13.html

Note though that 'cat' is superfluous here; all you need to do is
redirect input:
python rot13.py <sample.html >rot13.html

Hope that helps!

Chris Angelico