du - estimate file space usage du [-a| -s][-kx][-r][file ...] By
default, the du utility writes to standard output the size of
the file space allocated to, and the size of the file space
allocated to each subdirectory of, the file hierarchy rooted in
each of the specified files. The size of the file space
allocated to a file of type directory is defined as the sum
total of space allocated to all files in the file hierarchy
rooted in the directory plus the space allocated to the
directory itself. When du cannot stat() files or stat() or read
directories, it will report an error condition and the final
exit status will be affected. Files with multiple links will be
counted and written for only one entry. The directory entry that
is selected in the report is unspecified. By default, file sizes
are written in 512-byte units, rounded up to the next 512-byte
unit. The du utility supports the XBD specification, Utility
Syntax Guidelines . The following options are supported: - In
addition to the default output, repo