Linux显示文件大小（一）
linux一般使用du命令显示文件或者目录的大小
DU(1) User Commands DU(1)
NAME
du - estimate file space usage
SYNOPSIS
du [OPTION]... [FILE]...
du [OPTION]... --files0-from=F
DESCRIPTION
Summarize disk usage of each FILE, recursively for directories.
Mandatory arguments to long options are mandatory for short options
too.
-a, --all（显示所有文件大小，不限于目录）
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（可读性）
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（以1k为单位计算大小）
-l, --count-links
count sizes many times if hard linked
-m like --block-size=1M（以1兆为单位计算大小）
-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（显示总的大小）
display only a total for each argument
-x, --one-file-system
skip directories on different file systems
-X FILE, --exclude-from=FILE（<文件>或--exclude-from=<文件> 在<文件>指定目录或文件 ）
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’
--help display this help and exit
--version
output version information and exit
SIZE may be (or may be an integer optionally followed by) one of fol-
lowing: kB 1000, K 1024, MB 1000*1000, M 1024*1024, and so on for G, T,
P, E, Z, Y.
例如，显示/home/software2目录以M为单位
[root@yqrh5u2 software2]# du -h -m -x /home/software2/
129 /home/software2/
[root@yqrh5u2 software2]# ls
oracle-instantclient-basic-10.2.0.4-1.i386.zip VMwareTools-6.5.0-118166.tar.gz
[root@yqrh5u2 software2]# du -h -m oracle-instantclient-basic-10.2.0.4-1.i386.zip
34 oracle-instantclient-basic-10.2.0.4-1.i386.zip
[root@yqrh5u2 software2]# du -h -m VMwareTools-6.5.0-118166.tar.gz
96 VMwareTools-6.5.0-118166.tar.gz
[root@yqrh5u2 software2]# du -sh /home
3.6G /home
[root@yqrh5u2 software2]# du -ah
34M ./oracle-instantclient-basic-10.2.0.4-1.i386.zip
96M ./VMwareTools-6.5.0-118166.tar.gz
129M .
