Usage: igrep [options] pattern filename...
This program is part of the OpenImageIO (http://www.openimageio.org) tool suite. Detailed documentation is available in pdf format with the OpenImageIO distribution.
Print help message
Print version and exit
Ignore upper/lower case distinctions
Invert match (select non-matching files)
Pattern is an extended regular expression
Match against file name as well as metadata
List the matching files (no detail)
Recurse into directories
Print directories (when recursive)
Search all subimages of each file