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a = Dir['/media/backup/work/2014_05_15__re-encode_audio_SU-ANIMALS/original/*']
b = Dir['/media/backup/work/2014_05_15__re-encode_audio_SU-ANIMALS/re-encoded/*']
 
a_filenames_mapping = Hash[a.map{ |x| [File.basename(x, File.extname(x)), x] }]
 
b_filenames_mapping = Hash[b.map{ |x| [File.basename(x, File.extname(x)), x] }]
 
differing_files = a_filenames_mapping.keys - b_filenames_mapping.keys
 
differing_filenames = differing_files.map{ |x| File.basename(a_filenames_mapping[x]) }
p differing_filenames

Main.java:1: error: class, interface, or enum expected
a = Dir['/media/backup/work/2014_05_15__re-encode_audio_SU-ANIMALS/original/*']
^
Main.java:1: error: unclosed character literal
a = Dir['/media/backup/work/2014_05_15__re-encode_audio_SU-ANIMALS/original/*']
        ^
Main.java:1: error: illegal underscore
a = Dir['/media/backup/work/2014_05_15__re-encode_audio_SU-ANIMALS/original/*']
                                       ^
Main.java:1: error: unclosed comment
a = Dir['/media/backup/work/2014_05_15__re-encode_audio_SU-ANIMALS/original/*']
                                                                           ^
4 errors

Standard output is empty