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DF(1L) DF(1L)
NAME
df - summarize free disk space
SYNOPSIS
df [-aikPv] [-t fstype] [-x fstype] [--all] [--inodes]
[--type=fstype] [--exclude-type=fstype] [--kilobytes]
[--portability] [--help] [--version] [path...]
DESCRIPTION
This manual page documents the GNU version of df. df dis-
plays the amount of disk space available on the filesystem
containing each argument pathname. If no pathnames are
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 full pathname of a disk device node
containing a mounted filesystem, df shows the space avail-
able on that filesystem rather than on the filesystem con-
taining the device node (which is always the root filesys-
tem). 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
-a, --all
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.
-i, --inodes
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.
-k, --kilobytes
Print sizes in 1K blocks instead of 512-byte
blocks. This overrides the environment variable
POSIXLY_CORRECT.
-P, --portability
Use the POSIX output format. This is like the
default format except that the information about
each filesystem is always printed on exactly one
line; a mount device is never put on a line by
itself. This means that if the mount device name
FSF GNU File Utilities 1
DF(1L) DF(1L)
is more than 20 characters long (as for some net-
work mounts), the columns are misaligned.
-t, --type=fstype
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.
-x, --exclude-type=fstype
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
of df.
--help Print a usage message and exit with a non-zero sta-
tus.
--version
Print version information on standard error then
exit.
FSF GNU File Utilities 2