Usage:
treesed pattern1 <pattern2> -files <file1 file2 ...>
treesed pattern1 <pattern2> -tree

Treesed searches for pattern1. If pattern2 is supplied pattern1 is replaced by pattern2. If pattern2 is not supplied treesed just searches. A list of files can be supplied with the -files parameter. Treesed is also capable of search/replace in files in subdirectories if you supply the -tree parameter. All files in the current directory and subdirectories are processed. Always a backup is made of the original file, with a random numeric suffix. Fairly detailed documentation can be found at http://www.uwo.ca/its/doc/hdi/web/treesed.html.