The 3rd example has an error: $ find -empty -type -f find: Arguments to -type should contain only one letter Should be instead: $ find -empty -type

The 3rd example has an error: $ find -empty -type -f find: Arguments to -type should contain only one letter Should be instead: $ find -empty -type f Unfortunately, the site requires you to create some kind of account to comment. Not very user friendly :(