Add html tags in a text file

["Mikael Petterson (KI/EAB)" <mi...@ericsson.com>]

Hi,

I have a plain text file. I need to insert <html> at the very beginning
of the file and at the very end (</html>). And then change the file
extension.

I shell script I could use something like:

cat $1 | sed "s/^/<html>/g" | \
sed "s/$/<\/html>/g" >$1.html

Is there a similar function in ant?