How to get a word-by-word diff of two text files, and format it as html

wdiff-html

#!/bin/sh

FILE1=$1
FILE2=$2

# http://www.gnu.org/software/wdiff/
wdiff -w "<span style='color:red; text-decoration: line-through;'>" \
      -x "</span>" \
      -y "<span style='color:green'>" \
      -z "</span>" \
      $FILE1 $FILE2 > _tmpdiff.html

# replace newlines with <br>s
perl -i -p -e 's/\n/\<br\>/' _tmpdiff.html

cat _tmpdiff.html
rm _tmpdiff.html