du(1)
Name
du − print amount of disk usage
Syntax
du [−as] [name...]
Description
The du command gives the number of kilobytes contained in all files and, recursively, directories within each specified directory or file name. If name is missing, ‘.’ is used.
Absence of either −a or −s causes an entry to be generated for each directory only.
A file that has two links to it is only counted once.
Options
−aDisplays the disk usage for each file.
−sDisplays a summary total only.
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.