df(1) BSD General Commands Manual df(1)
NAME
df -- display free disk space
SYNOPSIS
df [-b | -h | -H | -k | -m | -g | -P] [-ailn] [-t] [-T type]
[file | filesystem ...]
LEGACY SYNOPSIS
df [-b | -h | -H | -k | -m | -P] [-ailn] [-t type] [-T type] [file |
filesystem ...]
DESCRIPTION
The df utility displays statistics about the amount of free disk space on
the specified filesystem or on the filesystem of which file is a part.
Values are displayed in 512-byte per block counts. If neither a file or
a filesystem operand is specified, statistics for all mounted filesystems
are displayed (subject to the -t option below).
The following options are available:
-a Show all mount points, including those that were mounted with the
MNT_IGNORE flag.
-b Use (the default) 512-byte blocks. This is only useful as a way
to override an BLOCKSIZE specification from the environment.
-g Use 1073741824-byte (1-Gbyte) blocks rather than the default.
Note that this overrides the BLOCKSIZE specification from the
environment.
-H "Human-readable" output. Use unit suffixes: Byte, Kilobyte,
Megabyte, Gigabyte, Terabyte and Petabyte in order to reduce the
number of digits to three or less using base 10 for sizes.
-h "Human-readable" output. Use unit suffixes: Byte, Kilobyte,
Megabyte, Gigabyte, Terabyte and Petabyte in order to reduce the
number of digits to three or less using base 2 for sizes.
-i Include statistics on the number of free inodes. This option is
now the default to conform to Version 3 of the Single UNIX
Specification (``SUSv3'')
-k Use 1024-byte (1-Kbyte) blocks, rather than the default. Note
that this overrides the BLOCKSIZE specification from the environ-
ment.
-l Only display information about locally-mounted filesystems.
-m Use 1048576-byte (1-Mbyte) blocks rather than the default. Note
that this overrides the BLOCKSIZE specification from the environ-
ment.
-n Print out the previously obtained statistics from the filesys-
tems. This option should be used if it is possible that one or
more filesystems 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 filesys-
tems, but will respond with the possibly stale statistics that
were previously obtained.
-P Use (the default) 512-byte blocks. This is only useful as a way
to override an BLOCKSIZE specification from the environment.
-T Only print out statistics for filesystems of the specified types.
More than one type may be specified in a comma separated list.
The list of filesystem types can be prefixed with ``no'' to spec-
ify the filesystem types for which action should not be taken.
For example, the df command:
df -T nonfs,mfs
lists all filesystems except those of type NFS and MFS. The
lsvfs(1) command can be used to find out the types of filesystems
that are available on the system.
-t If used with no arguments, this option is a no-op (Mac OS X
already prints the total allocated-space figures). If used with
an argument, it acts like -T, but this usage is deprecated and
should not be relied upon.
ENVIRONMENT
BLOCKSIZE If the environment variable BLOCKSIZE is set, the block counts
will be displayed in units of that size block.
BUGS
The -n and -t flags are ignored if a file or filesystem is specified.
LEGACY DESCRIPTION
The "capacity" percentage is normally rounded up to the next higher inte-
ger. In legacy mode, it is rounded down to the next lower integer.
When the -P option and the -k option are used together, sizes are
reported in 1024-blocks. In legacy mode, when the -P option and -k
option are used together, the last option specified dictates the reported
block size.
The -t option is normally a no-op (Mac OS X already prints the total
allocated-space figures). In legacy mode, it is equivalent to -T.
For more information about legacy mode, see compat(5).
SEE ALSO
lsvfs(1), quota(1), fstatfs(2), getfsstat(2), statfs(2), getmntinfo(3),
compat(5), fstab(5), mount(8), quot(8)
HISTORY
A df command appeared in Version 1 AT&T UNIX.
BSD May 8, 1995 BSD
Mac OS X 10.8 - Generated Tue Aug 21 08:18:33 CDT 2012