出來混，總是要還。
Linux的命令沒有學好，今天被問倒了。
查看目錄的大小。
NAME
du - estimate file space usage
SYNOPSIS
du [OPTION]... [FILE]...
DESCRIPTION
Summarize disk usage of each FILE, recursively for directories.
Mandatory arguments to long options are mandatory for short options too.
- -a, --all
- write counts for all files, not just directories
- -B, --block-size=SIZE use SIZE-byte blocks
- -b, --bytes
- print size in bytes
- -c, --total
- produce a grand total
- -D, --dereference-args
- dereference FILEs that are symbolic links
- -h, --human-readable
- print sizes in human readable format (e.g., 1K 234M 2G)
- -H, --si
- likewise, but use powers of 1000 not 1024
- -k
- like --block-size=1K
- -l, --count-links
- count sizes many times if hard linked
- -L, --dereference
- dereference all symbolic links
- -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 filesystems
- -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
- --help
- display this help and exit
- --version
- output version information and exit