The following command line will report duplicate pictures:
- using libpuzzle ( -I)
- whose sizes are greater than 8192 bytes ( -m 8192 )
- found recursively ( -r)
starting in your home directory.

ftwin -m 8192 -v -r -I ${HOME} | less

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This line will report duplicate files (no more in "image mode", but according
to their content) whose extension is .txt and that are not in a .svn directory:

ftwin -e ".*/\.svn/.*" -w ".*\.txt$" -v -r ${HOME}

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If you're importing pictures from an external device and you want to erase
duplicates:
mkdir "${HOME}/tmppix"
cp /media/SDCARD/*JPG "${HOME}/tmppix"

ftwin -r -v -w ".*\.(jpe?g)$" -c -p "${HOME}/tmppix" -s "," "${HOME}" | tee log

-r to recurse subdir
-v for verbose mode
-w ".*\.(jpe?g)$" to limit the information collecting to filename that match
   this regexp.
-c to make the previous regexp case unsensitive.
-p "${HOME}/tmppix" for displaying these files first in the duplicate report.
-s "," to separate duplicates with "," character.

Then you may select files to remove by using a shell line like the following:
cut -d"," -f1 -s < log | grep "tmppix" | while read FILE; do rm -f "${FILE}" ; done

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You might try the following command to find duplicates independantly from
resizing, recompressing, recoloring, slighly modifying operations.

ftwin -r -v -I -p "${HOME}/tmppix" -s "," "${HOME}" | tee log

-I will run ftwin in image comparison mode (using libpuzzle).


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