new switches

• changed the exclude switch from -e to -x
• added -l switch to only list duplicate without further actions
• new -e switch force the tool to consider empty files (size == 0). Default is to ignore them.

small bug fix

v1.1.1

Skip empty strings in containsSubstring function check

v1.0

Initial (and most probably final) release

V1.1

added a few options for safety.