The below one liner will open all files in its path and change the word ‘MOO’ in any of the files to the word ‘BOO’.
find . -type f | xargs /usr/iw-home/iw-perl/bin/iwperl -i -p -e 's/MOO/BOO/g;'
This script has only been lightly tested so please make a backup of your files before running this!