I was a bit suspicious before using this tool - because usually I know where my files are etc ... but I decide to make a test with my external HD (used for backups)
To make the test more interesting I noted the free space before launching fslint and it shows 8.1 GB free.
Here below is the "fslint-gui" main screen - on the top is shown the search path - and below are the various options - by default it looks for "duplicates" now press the Find button (below)
The search process is pretty long, checking all the files with various methods - to make sure there are really duplicates files.
It took around 20-30 mn in my example.
When all "duplicate files" are finally displayed - you can delete extra files, right click and open them - to have a look, save the list of duplicate files and ... the cool feature "Merge" them - which mean fslint will keep multiple version of the same files - but hardlink them - so the space is used only once.
Tip : Now the funny thing with Merge is that the feature is a bit counter intuitive - because if you select 2 files to be "Merged" - these 2 files will actually be excluded for the Merge ... so make sure you toggle your selection before "Merging"
Result is pretty impressive, after "Merging" all my duplicates - see below my Free space jumped to almost 19GB (remember I had only 8GB to begin with) - pretty cool stuff!
You can find other reviews for fslint here and there.
