Usage: df [OPTION]... [FILE]...
Show information about the file system on which each FILE resides,
or all file systems by default.
Mandatory arguments to long options are mandatory for short options too.
-a, --all include dummy file systems
-B, --block-size=SIZE use SIZE-byte blocks
--direct show statistics for a file instead of mount point
--total produce a grand total
-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)
--help display this help and exit
--version output version information and exit
Display values are in units of the first available SIZE from --block-size,
and the DF_BLOCK_SIZE, BLOCK_SIZE and BLOCKSIZE environment variables.
Otherwise, units default to 1024 bytes (or 512 if POSIXLY_CORRECT is set).
SIZE may be (or may be an integer optionally followed by) one of following:
KB 1000, K 1024, MB 1000*1000, M 1024*1024, and so on for G, T, P, E, Z, Y.
Report df bugs to bug-coreutils@gnu.org
GNU coreutils home page: <http://www.gnu.org/software/coreutils/>
General help using GNU software: <http://www.gnu.org/gethelp/>
For complete documentation, run: info coreutils 'df invocation'
Usage: df [OPTION]... [FILE]...
Show information about the file system on which each FILE resides,
or all file systems by default.
Mandatory arguments to long options are mandatory for short options too.
-a, --all 展示全部文件系统
-B, --block-size=SIZE 设置区块大小
--direct 显示文件的统计信息而不是挂载点的统计信息
--total 生成总计栏
-h, --human-readable 以可读的方式输出
-H, --si 同-h,不过单位是1000而不是1024
-i, --inodes 展示inode信息而不是区块使用信息
-k 设置区块大小为1k
-l, --local 限制查询本地系统
--no-sync 执行前不执行sync
-P, --portability 使用POSIX输出格式
--sync 执行前执行sync
-t, --type=TYPE 限制指定类型的文件系统
-T, --print-type 打印文件类型
-x, --exclude-type=TYPE 排除指定文件类型的文件系统
-v (ignored)
--help 显示帮助文档
--version 输出版本信息并退出
显示的值以第一个--block-size,DF_BLOCK_SIZE, BLOCK_SIZE 和 BLOCKSIZE 环境变量中的第一个可用的大小为单位。否则，单位默认为1024字节（如果设置POSIXLY_CORRECT则为512）
SIZE may be (or may be an integer optionally followed by) one of following:
KB 1000, K 1024, MB 1000*1000, M 1024*1024, and so on for G, T, P, E, Z, Y.
大小可以是（或者后面也可以是一个整数）以下其中一个：
对于G、T、P、E、Z、Y，KB 1000、K 1024、MB 1000*1000、M 1024*1024，依此类推。