du(1) - estimate file space usage
Summarize disk usage of each FILE, recursively for directories.
-a, --all
       write counts for all files, not just directories
       print  apparent  sizes,  rather than disk usage; although the apparent size is usually smaller, it
       may be larger due to holes in (`sparse') files, internal fragmentation, indirect blocks,  and  the
-B, --block-size=SIZE
       scale  sizes  by SIZE before printing them.  E.g., `-BM' prints sizes in units of 1,048,576 bytes.
       See SIZE format below.
-b, --bytes
       equivalent to `--apparent-size --block-size=1'
-c, --total
       produce a grand total
-D, --dereference-args
       dereference only symlinks that are listed on the command line
       summarize disk usage of the NUL-terminated file names specified in file F; If F  is  -  then  read
       names from standard input
-H     equivalent to --dereference-args (-D)
-h, --human-readable
       print sizes in human readable format (e.g., 1K 234M 2G)
--si   like -h, but use powers of 1000 not 1024
-k     like --block-size=1K
-l, --count-links
       count sizes many times if hard linked
-m     like --block-size=1M
-L, --dereference
       dereference all symbolic links
-P, --no-dereference
       don't follow any symbolic links (this is the default)
-0, --null
       end each output line with 0 byte rather than newline
-S, --separate-dirs
       do not include size of subdirectories
-s, --summarize
       display only a total for each argument
-x, --one-file-system
       skip directories on different file systems
-X, --exclude-from=FILE
       exclude files that match any pattern in FILE
       exclude files that match PATTERN
-d, --max-depth=N
       print  the  total  for a directory (or file, with --all) only if it is N or fewer levels below the
       command line argument;  --max-depth=0 is the same as --summarize
--time show time of the last modification of any file in the directory, or any of its subdirectories
       show time as WORD instead of modification time: atime, access, use, ctime or status
       show times using style STYLE: full-iso, long-iso, iso, +FORMAT FORMAT is interpreted like `date'
--help display this help and exit
       output version information and exit