NAME

du − summarize disk usage

SYNOPSIS

du [ −sar ] [ names ]

DESCRIPTION

du reports the number of 1024-byte logical blocks contained in all files and (recursively) directories within each directory and file specified by the names argument.  The block count includes the indirect blocks of the file.  If names is missing, the current directory is used. 

The optional arguments are as follows:

−s causes only the grand total (for each of the specified names) to be given.

−a causes an output line to be generated for each file. 

If neither −s or −a is specified, an output line is generated for each directory only. 

−r will cause du to generate messages about directories that cannot be be read, files that cannot be opened, etc., rather than being silent (the default). 

A file with two or more links is only counted once. 

BUGS

If the −a option is not used, non-directories given as arguments are not listed. 
If there are links between files in different directories where the directories are on separate branches of the file system hierarchy, du will count the excess files more than once. 
Files with holes in them will get an incorrect block count.

September 29, 2021