NAME

du − summarize disk usage

SYNTAX

du [ −s ] [ −a ] [ name... ]

DESCRIPTION

The du command 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 generated 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. 

RESTRICTIONS

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.