Size of a directory & Free disk space

#du /home/andri
Command tsb memberikan informasi size directory dari /home/andri
adapun optionnya sbb:
#du [OPTION]… [FILE]…
-a, –all write counts for all files, not just directories
–apparent-size 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 like
-B, –block-size=SIZE use SIZE-byte blocks
-b, –bytes equivalent to `–apparent-size –block-size=1′
-c, –total produce a grand total
-D, –dereference-args dereference FILEs that are symbolic links
–files0-from=F summarize disk usage of the NUL-terminated file
names specified in file F
-H like –si, but also evokes a warning; will soon
change to be 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 FILE, –exclude-from=FILE Exclude files that match any pattern in FILE.
–exclude=PATTERN Exclude files that match PATTERN.
–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
–time=WORD show time as WORD instead of modification time:
atime, access, use, ctime or status
–time-style=STYLE show times using style STYLE:
full-iso, long-iso, iso, +FORMAT
FORMAT is interpreted like `date’
‘df’ – finding the disk free space / disk usage
#df [OPTION]… [FILE]…

Mandatory arguments to long options are mandatory for short options too.
-a, –all include file systems having 0 blocks
-B, –block-size=SIZE use SIZE-byte blocks
-h, –human-readable print sizes in human readable format (e.g., 1K 234M 2G)
-H, –si likewise, but use powers of 1000 not 1024
-i, –inodes list inode information instead of block usage
-k like –block-size=1K
-l, –local limit listing to local file systems
–no-sync do not invoke sync before getting usage info (default)
-P, –portability use the POSIX output format
–sync invoke sync before getting usage info
-t, –type=TYPE limit listing to file systems of type TYPE
-T, –print-type print file system type
-x, –exclude-type=TYPE limit listing to file systems not of type TYPE
-v (ignored)