DF(1) FreeBSD General Commands Manual DF(1)
NAME
df - display free disk space
SYNOPSIS
df [--libxo] [-b | -g | -H | -h | -k | -m | -P] [-acilnT] [-,] [-t type]
[file | filesystem ...]
DESCRIPTION
The df utility displays statistics about the amount of free disk space on
the specified mounted file system or on the file system of which file is
a part. By default block counts are displayed with an assumed block size
of 512 bytes. If neither a file or a file system operand is specified,
statistics for all mounted file systems are displayed (subject to the -t
option below).
The following options are available:
--libxo
Generate output via libxo(3) in a selection of different human
and machine readable formats. See xo_parse_args(3) for details
on command line arguments.
-a Show all mount points, including those that were mounted with the
MNT_IGNORE flag. This is implied for file systems specified on
the command line.
-b Explicitly use 512 byte blocks, overriding any BLOCKSIZE
specification from the environment. This is the same as the -P
option. The -k option overrides this option.
-c Display a grand total.
-g Use 1073741824 byte (1 Gibibyte) blocks rather than the default.
This overrides any BLOCKSIZE specification from the environment.
-h "Human-readable" output. Use unit suffixes: Byte, Kibibyte,
Mebibyte, Gibibyte, Tebibyte and Pebibyte (based on powers of
1024) in order to reduce the number of digits to four or fewer.
-H, --si
Same as -h but based on powers of 1000.
-i Include statistics on the number of free and used inodes. In
conjunction with the -h or -H options, the number of inodes is
scaled by powers of 1000.
-k Use 1024 byte (1 Kibibyte) blocks rather than the default. This
overrides the -P option and any BLOCKSIZE specification from the
environment.
-l Select locally-mounted file system for display. If used in
combination with the -t type option, file system types will be
added or excluded acccording to the parameters of that option.
-m Use 1048576 byte (1 Mebibyte) blocks rather than the default.
This overrides any BLOCKSIZE specification from the environment.
-n Print out the previously obtained statistics from the file
systems. This option should be used if it is possible that one
or more file systems are in a state such that they will not be
able to provide statistics without a long delay. When this
option is specified, df will not request new statistics from the
file systems, but will respond with the possibly stale statistics
that were previously obtained.
-P Explicitly use 512 byte blocks, overriding any BLOCKSIZE
specification from the environment. This is the same as the -b
option. The -k option overrides this option.
-t type
Select file systems to display. More than one type may be
specified in a comma separated list. The list of file system
types can be prefixed with "no" to specify the file system types
for which action should not be taken. If used in combination
with the -l option, the parameters of this option will modify the
list of locally-mounted file systems selected by the -l option.
For example, the df command:
df -t nonfs,nullfs
lists all file systems except those of type NFS and NULLFS. The
lsvfs(1) command can be used to find out the types of file
systems that are available on the system.
-T Include file system type.
-, (Comma) Print sizes grouped and separated by thousands using the
non-monetary separator returned by localeconv(3), typically a
comma or period. If no locale is set, or the locale does not
have a non-monetary separator, this option has no effect.
ENVIRONMENT
BLOCKSIZE Specifies the units in which to report block counts. This
uses getbsize(3), which allows units of bytes or numbers
scaled with the letters k (for multiples of 1024 bytes), m
(for multiples of 1048576 bytes) or g (for gibibytes). The
allowed range is 512 bytes to 1 GB. If the value is outside,
it will be set to the appropriate limit.
EXAMPLES
Show human readable free disk space for all mount points including file
system type:
$ df -ahT
Filesystem Type Size Used Avail Capacity Mounted on
/dev/ada1p2 ufs 213G 152G 44G 78% /
devfs devfs 1.0K 1.0K 0B 100% /dev
/dev/ada0p1 ufs 1.8T 168G 1.5T 10% /data
linsysfs linsysfs 4.0K 4.0K 0B 100% /compat/linux/sys
/dev/da0 msdosfs 7.6G 424M 7.2G 5% /mnt/usb
Show previously collected data including inode statistics except for
devfs or linsysfs file systems. Note that the "no" prefix affects all
the file systems in the list and the -t option can be specified only
once:
$ df -i -n -t nodevfs,linsysfs
Filesystem 1K-blocks Used Avail Capacity iused ifree %iused
Mounted on
/dev/ada1p2 223235736 159618992 45757888 78% 1657590 27234568 6% /
/dev/ada0p1 1892163184 176319420 1564470712 10% 1319710 243300576 1%
/data
/dev/da0 7989888 433664 7556224 5% 0 0 100%
/mnt/usb
Show human readable information for the file system containing the file
/etc/rc.conf:
$ df -h /etc/rc.conf
Filesystem Size Used Avail Capacity Mounted on
/dev/ada1p2 213G 152G 44G 78% /
Same as above but specifying some file system:
$ df -h /dev/ada1p2
Filesystem Size Used Avail Capacity Mounted on
/dev/ada1p2 213G 152G 44G 78% /
SEE ALSO
lsvfs(1), quota(1), fstatfs(2), getfsstat(2), statfs(2), getbsize(3),
getmntinfo(3), libxo(3), localeconv(3), xo_parse_args(3), fstab(5),
mount(8), pstat(8), quot(8), swapinfo(8)
STANDARDS
With the exception of most options, the df utility conforms to IEEE Std
1003.1-2004 ("POSIX.1"), which defines only the -k, -P and -t options.
HISTORY
A df command appeared in Version 1 AT&T UNIX.
BUGS
The -n flag is ignored if a file or file system is specified. Also, if a
mount point is not accessible by the user, it is possible that the file
system information could be stale.
The -b and -P options are identical. The former comes from the BSD
tradition, and the latter is required for IEEE Std 1003.1-2004
("POSIX.1") conformity.
FreeBSD 13.1-RELEASE-p6 October 5, 2020 FreeBSD 13.1-RELEASE-p6
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