$ hadoop fs -help ls
-ls [-d] [-h] [-R] [<path> ...]: List the contents that match the specified file pattern. If
path is not specified, the contents of /user/<currentUser>
will be listed. Directory entries are of the form
dirName (full path) <dir>
and file entries are of the form
fileName(full path) <r n> size
where n is the number of replicas specified for the file
and size is the size of the file, in bytes.
-d Directories are listed as plain files.
-h Formats the sizes of files in a human-readable fashion
rather than a number of bytes.
-R Recursively list the contents of directories.