linux - df (1)
df - summarize free disk space
df [-aikPv] [-t fstype] [-x fstype] [--all] [--inodes]
[--type=fstype] [--exclude-type=fstype] [--kilobytes]
[--portability] [--print-type] [--help] [--version] [file-
This manual page documents the GNU version of df. df dis-
plays 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.
Include in the listing filesystems that have 0
blocks, which are omitted by default. Such
filesystems are typically special-purpose pseudo-
filesystems, such as automounter entries. On some
systems, filesystems of type ``ignore'' or ``auto''
are also omitted by default and included in the
listing by this option.
List inode usage information instead of block
usage. An inode (short for ``index node'') is a
special kind of disk block that contains informa-
tion about a file, such as its owner, permissions,
timestamps, and location on the disk.
Print sizes in 1K blocks instead of 512-byte
blocks. This overrides the environment variable
Use the POSIX output format. This is like the
default format except that the information about
itself. This means that if the mount device name
is more than 20 characters long (as for some net-
work mounts), the columns are misaligned.
Print a type string for each filesystem. Any such
printed filesystem type name may be used as an
argument to either of the --type= or
Limit the listing to filesystems of type fstype.
Multiple filesystem types can be shown by giving
multiple -t options. By default, all filesystem
types are listed.
Limit the listing to filesystems not of type
fstype. Multiple filesystem types can be elimi-
nated by giving multiple -x options. By default,
all filesystem types are listed.
-v Ignored; for compatibility with System V versions
--help Print a usage message on standard output and exit
Print version information on standard output then