DU(1)                                                       DU(1)

          du  -  summarize disk usage

          du [ -s ] [ -a ] [ name ... ]

          Du gives the number of blocks contained in all files and
          (recursively) directories within each specified directory or
          file name. If name is missing, `.'  is used.

          The optional argument -s causes only the grand total to be
          given.  The optional argument -a causes an entry to be gen-
          erated for each file.  Absence of either causes an entry to
          be generated for each directory only.

          A file which has two links to it is only counted once.

          Non-directories given as arguments (not under -a option) are
          not listed.
          If there are too many distinct linked files, du counts the
          excess files multiply.