df(diskfree)
功能说明：显示磁盘的相关信息。
语法：df[-ahHiklmPT][--block-size=<区块大小>][-t<文件系统类型>][-x<文件系统类型>][--help][--no-sync][--sync][--version][文件或设备]
补充说明：df可显示磁盘的文件系统与使用情形。
参数：
-a或--all包含全部的文件系统。
--block-size=<区块大小>以指定的区块大小来显示区块数目。
-h或--human-readable以可读性较高的方式来显示信息。
-H或--si与-h参数相同，但在计算时是以1000Bytes为换算单位而非1024Bytes。
-i或--inodes显示inode的信息。
-k或--kilobytes指定区块大小为1024字节。
-l或--local仅显示本地端的文件系统。
-m或--megabytes指定区块大小为1048576字节。
--no-sync在取得磁盘使用信息前，不要执行sync指令，此为预设值。
-P或--portability使用POSIX的输出格式。
--sync在取得磁盘使用信息前，先执行sync指令。
-t<文件系统类型>或--type=<文件系统类型>仅显示指定文件系统类型的磁盘信息。
-T或--print-type显示文件系统的类型。
-x<文件系统类型>或--exclude-type=<文件系统类型>不要显示指定文件系统类型的磁盘信息。
--help显示帮助。
--version显示版本信息。
[文件或设备]指定磁盘设备。
#p#
NAME
df - report filesystem disk space usage
SYNOPSIS
df [OPTION]... [FILE]...
DESCRIPTION
This manual page documents the GNU version of df. df displays the amount of disk space available on the filesystem containing each file name argument. If no file name is given, the space available on all currently mounted filesystems is shown. Disk space is shown in 1K blocks by default, unless the environment variable POSIXLY_CORRECT is set, in which case 512-byte blocks are used.
If an argument is the absolute file name of a disk device node containing a mounted filesystem, df shows the space available on that filesystem rather than on the filesystem containing the device node (which is always the root filesystem). This version of df cannot show the space available on unmounted filesystems, because on most kinds of systems doing so requires very nonportable intimate knowledge of filesystem structures.
OPTIONS
Show information about the filesystem on which each FILE resides, or all filesystems by default.
Mandatory arguments to long options are mandatory for short options too.
- -a, --all
- include filesystems 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 filesystems
- --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 filesystems of type TYPE
- -T, --print-type
- print filesystem type
- -x, --exclude-type=TYPE
- limit listing to filesystems not of type TYPE
- -v
- (ignored)
- --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 following: kB 1000, K 1024, MB 1000*1000, M 1024*1024, and so on for G, T, P, E, Z, Y.
AUTHOR
Written by Torbjorn Granlund, David MacKenzie, and Paul Eggert.
REPORTING BUGS
Report bugs to <bug-coreutils@gnu.org>.
COPYRIGHT
Copyright © 2004 Free Software Foundation, Inc.
This is free software; see the source for copying conditions. There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
SEE ALSO
The full documentation for df is maintained as a Texinfo manual. If the info and df programs are properly installed at your site, the command
- info coreutils df
should give you access to the complete manual.
