01-28-2014
You may have to do this the slow way. So.. you could do your original command and the a second command finding the links only (e.g. using find) that go off filesystem and subtracting that out (find might not do it though).
You may be able to do it one pass using find and/or looping, but it will be slow.
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DU(1) BSD General Commands Manual DU(1)
NAME
du -- display disk usage statistics
SYNOPSIS
du [-Aclnx] [-H | -L | -P] [-g | -h | -k | -m] [-a | -s | -d depth] [-B blocksize] [-I mask] [-t threshold] [file ...]
DESCRIPTION
The du utility displays the file system block usage for each file argument and for each directory in the file hierarchy rooted in each direc-
tory argument. If no file is specified, the block usage of the hierarchy rooted in the current directory is displayed.
The options are as follows:
-A Display the apparent size instead of the disk usage. This can be helpful when operating on compressed volumes or sparse files.
-B blocksize
Calculate block counts in blocksize byte blocks. This is different from the -h, -k, -m and -g options or setting BLOCKSIZE and gives
an estimate of how much space the examined file hierarchy would require on a filesystem with the given blocksize. Unless in -A mode,
blocksize is rounded up to the next multiple of 512.
-H Symbolic links on the command line are followed, symbolic links in file hierarchies are not followed.
-I mask
Ignore files and directories matching the specified mask.
-L Symbolic links on the command line and in file hierarchies are followed.
-P No symbolic links are followed. This is the default.
-a Display an entry for each file in a file hierarchy.
-c Display a grand total.
-d depth
Display an entry for all files and directories depth directories deep.
-g Display block counts in 1073741824-byte (1 GiB) blocks.
-h ``Human-readable'' output. Use unit suffixes: Byte, Kilobyte, Megabyte, Gigabyte, Terabyte and Petabyte.
-k Display block counts in 1024-byte (1 kiB) blocks.
-l If a file has multiple hard links, count its size multiple times. The default behavior of du is to count files with multiple hard
links only once. When the -l option is specified, the hard link checks are disabled, and these files are counted (and displayed) as
many times as they are found.
-m Display block counts in 1048576-byte (1 MiB) blocks.
-n Ignore files and directories with user ``nodump'' flag (UF_NODUMP) set.
-r Generate messages about directories that cannot be read, files that cannot be opened, and so on. This is the default case. This
option exists solely for conformance with X/Open Portability Guide Issue 4 (``XPG4'').
-s Display an entry for each specified file. (Equivalent to -d 0)
-t threshold
Display only entries for which size exceeds threshold. If threshold is negative, display only entries for which size is less than
the absolute value of threshold.
-x File system mount points are not traversed.
The du utility counts the storage used by symbolic links and not the files they reference unless the -H or -L option is specified. If either
the -H or -L option is specified, storage used by any symbolic links which are followed is not counted (or displayed). The -H, -L and -P
options override each other and the command's actions are determined by the last one specified.
The -h, -k and -m options all override each other; the last one specified determines the block counts used.
ENVIRONMENT
BLOCKSIZE If the environment variable BLOCKSIZE is set, and the -h, -k or -m options are not specified, the block counts will be displayed
in units of that block size. If BLOCKSIZE is not set, and the -h, -k or -m options are not specified, the block counts will be
displayed in 512-byte blocks.
EXAMPLES
Show disk usage for all files in the current directory. Output is in human-readable form:
# du -ah
Summarize disk usage in the current directory:
# du -hs
Summarize disk usage for a specific directory:
# du -hs /home
Show name and size of all C files in a specific directory. Also display a grand total at the end:
# du -ch /usr/src/sys/kern/*.c
SEE ALSO
df(1), chflags(2), fts(3), symlink(7), quot(8)
HISTORY
A du command appeared in Version 1 AT&T UNIX.
BSD
November 4, 2012 BSD