fslint is a toolset to find various problems with filesystems, including duplicate files and problematic filenames etc.
To access the individual command line tools one can change to, or add to $PATH the /usr/share/fslint/fslint directory on a standard install. Each of the commands in that directory have a --help option which further details their parameters.
This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2 of the License, or any later version.
This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details, which is available at www.gnu.org