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DU(1L) DU(1L)
NNAAMMEE
du - summarize disk usage
SSYYNNOOPPSSIISS
dduu [-abcklsxDLS] [--all] [--total] [--count-links] [--sum-
marize] [--bytes] [--kilobytes] [--one-file-system]
[--separate-dirs] [--dereference] [--dereference-args]
[--help] [--version] [path...]
DDEESSCCRRIIPPTTIIOONN
This manual page documents the GNU version of dduu. dduu dis-
plays the amount of disk space used by each argument and
for each subdirectory of directory arguments. The space
is measured in 1K blocks by default, unless the environ-
ment variable POSIXLY_CORRECT is set, in which case
512-byte blocks are used.
OOPPTTIIOONNSS
_-_a_, _-_-_a_l_l
Display counts for all files, not just directories.
_-_b_, _-_-_b_y_t_e_s
Print sizes in bytes.
_-_c_, _-_-_t_o_t_a_l
Write a grand total of all of the arguments after
all arguments have been processed. This can be
used to find out the disk usage of a directory,
with some files excluded.
_-_k_, _-_-_k_i_l_o_b_y_t_e_s
Print sizes in kilobytes. This overrides the envi-
ronment variable POSIXLY_CORRECT.
_-_l_, _-_-_c_o_u_n_t_-_l_i_n_k_s
Count the size of all files, even if they have
appeared already in another hard link.
_-_s_, _-_-_s_u_m_m_a_r_i_z_e
Display only a total for each argument.
_-_x_, _-_-_o_n_e_-_f_i_l_e_-_s_y_s_t_e_m
Skip directories that are on different filesystems
from the one that the argument being processed is
on.
_-_D_, _-_-_d_e_r_e_f_e_r_e_n_c_e_-_a_r_g_s
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 like /usr/tmp where they are symbolic
links.
FSF GNU File Utilities 1
DU(1L) DU(1L)
_-_L_, _-_-_d_e_r_e_f_e_r_e_n_c_e
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).
_-_S_, _-_-_s_e_p_a_r_a_t_e_-_d_i_r_s
Count the size of each directory separately, not
including the sizes of subdirectories.
_-_-_h_e_l_p Print a usage message and exit with a non-zero sta-
tus.
_-_-_v_e_r_s_i_o_n
Print version information on standard error then
exit.
BBUUGGSS
On BSD systems, dduu 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 cor-
rect values for files that are NFS-mounted from BSD sys-
tems. This is due to a flaw in HP-UX; it also affects the
HP-UX dduu program.
FSF GNU File Utilities 2