Disk Usage – report the amount of disk space used by the specified files and for each subdirectory.
du [options]... [file]...
With no arguments, `du’ reports the disk space for the current directory. Normally the disk space is printed in units of 1024 bytes, but this can be overridden
-a --all Show counts for all files, not just directories. -b --bytes Print sizes in bytes, overriding the default block size (*note Block size::). -c --total Print a grand total of all arguments after all arguments have been processed. This can be used to find out the total disk usage of a given set of files or directories. -D --dereference-args Dereference symbolic links that are command line arguments. Does not affect other symbolic links. This is helpful for finding out the disk usage of directories, such as `/usr/tmp', which are often symbolic links. -h --human-readable Append a size letter such as `M' for megabytes to each size. Powers of 1024 are used, not 1000; `M' stands for 1,048,576 bytes. Use the `-H' or `--si' option if you prefer powers of 1000. -H --si Append a size letter such as `M' for megabytes to each size. (SI is the International System of Units, which defines these letters as prefixes.) Powers of 1000 are used, not 1024; `M' stands for 1,000,000 bytes. Use the `-h' or `--human-readable' option if you prefer powers of 1024. -k --kilobytes Print sizes in 1024-byte blocks, overriding the default block size (*note Block size::). -l --count-links Count the size of all files, even if they have appeared already (as a hard link). -L --dereference Dereference symbolic links (show the disk space used by the file or directory that the link points to instead of the space used by the link). --max-depth=DEPTH Show the total for each directory (and file if -all) that is at most MAX_DEPTH levels down from the root of the hierarchy. The root is at level 0, so `du --max-depth=0' is equivalent to `du -s'. -m --megabytes Print sizes in megabyte (that is, 1,048,576-byte) blocks. -s --summarize Display only a total for each argument. -S --separate-dirs Report the size of each directory separately, not including the sizes of subdirectories. -x --one-file-system Skip directories that are on different filesystems from the one that the argument being processed is on. --exclude=PAT When recursing, skip subdirectories or files matching PAT. For example, `du --exclude='*.o'' excludes files whose names end in `.o'. -X FILE --exclude-from=FILE Like `--exclude', except take the patterns to exclude from FILE, one per line. If FILE is `-', take the patterns from standard input.
On BSD systems, `du’ reports sizes that are half the correct values
for files that are NFS-mounted from HP-UX systems. On HP-UX systems,
it reports sizes that are twice the correct values for files that are
NFS-mounted from BSD systems. This is due to a flaw in HP-UX; it also
affects the HP-UX `du’ program.
List the total files sizes for everything 1 directory (or less) below the currrent directory ( . )