du

disk usage

Summarize disk usage by tree, recursively for directories.

--max-depth=n	total for a directory (or file with --all) only if it is n or fewer levels below --max-depth=0 is the same as --summarize
-s --summarize	only a total for each tree
-c --total	grand total of all trees specified
-B --block-size=size	use byte sizeblocks size an integer followed by an optional: kB=1000, K=1024, MB=1,000,000, M=1,048,576, … G, T, P, E, Z, Y .
-k	same as --block-size=1K
-b --bytes	size in bytes
-h --human-readable	sizes in human? readable format (e.g., 1K 234M 2G ragged right)
--si -H	£ use powers of 1,000  Symbolic links on the command line are followed, symbolic links in file hierarchies are not .
-a --all	count all files, not just directories
-l --count-links	count sizes multiple times if hard linked (i.e. multiple directory entries reference a single file).
-D --dereference-args	dereference files that are symbolic links as if they were in this directory.
-L --dereference	dereference all symbolic links
-S --separate-dirs	do not include size of subdirectories
-x --one-file-system	skip directories on different filesystems
-X file --exclude-from=file	Exclude files that match any pattern in file.
--exclude=pattern	Exclude files that match pattern.
-A	 Apparent size for compressed volumes or sparse files.
--help
--version

Directories are not necessarily listed in alphabetical order unless   | sort -k2   is appended to the command.

pattern is a shell pattern (not a regular expression).
? matches any one character,
* matches any string (composed of zero, one or multiple characters).

Example: *.o will match files ending in .o .

Exclude all files and subdirectories ending in .o (including the file .o ).

   du --exclude='*.o' 

Comparing trees on different volumes will produce different sizes if they use different allocation schemes.

see ncdu