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DF

Posted On 2007-04-27 by FortyPoundHead
Keywords: Command Reference
Tags: Linux Commandline Linux
Views: 1864


Disk Free - display free disk space.
With no arguments, `df'' reports the space used and available on all currently mounted filesystems (of all types). Otherwise, `df'' reports on the filesystem containing each argument file.

SYNTAX
df [option]... [file]...

Normally the disk space is printed in units of 1024 bytes, but this
can be overridden.

OPTIONS

`-a''
`--all''
Include in the listing filesystems that have a size of 0 blocks,
which are omitted by default. Such filesystems are typically
special-purpose pseudo-filesystems, such as automounter entries.
Also, filesystems of type "ignore" or "auto", supported by some
operating systems, are only included if this option is specified.

`-h''
`--human-readable''
Append a size letter such as `M'' for megabytes to each size.
Powers of 1024 are used, not 1000; `M'' stands for 1,048,576 bytes.
Use the `-H'' or `--si'' option if you prefer powers of 1000.

`-H''
`--si''
Append a size letter such as `M'' for megabytes to each size. (SI
is the International System of Units, which defines these letters
as prefixes.) Powers of 1000 are used, not 1024; `M'' stands for
1,000,000 bytes. Use the `-h'' or `--human-readable'' option if you
prefer powers of 1024.

`-i''
`--inodes''
List inode usage information instead of block usage. An inode
(short for index node) is contains information about a file such
as its owner, permissions, timestamps, and location on the disk.

`-k''
`--kilobytes''
Print sizes in 1024-byte blocks, overriding the default block size.

`-l''
`--local''
Limit the listing to local filesystems. By default, remote
filesystems are also listed.

`-m''
`--megabytes''
Print sizes in megabyte (that is, 1,048,576-byte) blocks.

`--no-sync''
Do not invoke the `sync'' system call before getting any usage data.
This may make `df'' run significantly faster on systems with many
disks, but on some systems (notably SunOS) the results may be
slightly out of date. This is the default.

`-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 is more than
20 characters long (e.g., for some network mounts), the columns
are misaligned.

`--sync''
Invoke the `sync'' system call before getting any usage data. On
some systems (notably SunOS), doing this yields more up to date
results, but in general this option makes `df'' much slower,
especially when there are many or very busy filesystems.

`-t FSTYPE''
`--type=FSTYPE''
Limit the listing to filesystems of type FSTYPE. Multiple
filesystem types can be specified by giving multiple `-t'' options.
By default, nothing is omitted.

`-T''
`--print-type''
Print each filesystem''s type. The types printed here are the same
ones you can include or exclude with `-t'' and `-x''. The particular
types printed are whatever is supported by the system. Here are
some of the common names (this list is certainly not exhaustive):

`nfs''
An NFS filesystem, i.e., one mounted over a network from
another machine. This is the one type name which seems to be
used uniformly by all systems.

`4.2, ufs, efs...''
A filesystem on a locally-mounted hard disk. (The system
might even support more than one type here; Linux does.)

`hsfs, cdfs''
A filesystem on a CD-ROM drive. HP-UX uses `cdfs'', most other
systems use `hsfs'' (`hs'' for `High Sierra'').

`pcfs''
An MS-DOS filesystem, usually on a diskette.

`-x FSTYPE''
`--exclude-type=FSTYPE''
Limit the listing to filesystems not of type FSTYPE. Multiple
filesystem types can be eliminated by giving multiple `-x''
options. By default, no filesystem types are omitted.

`-v''
Ignored; for compatibility with System V versions of `df''.If an argument FILE is a disk device file containing a mounted filesystem, `df'' shows the space available on that filesystem rather than on the filesystem containing the device node (i.e., the root filesystem). GNU `df'' does not attempt to determine the disk usage on unmounted filesystems, because on most kinds of systems doing so requires extremely nonportable intimate knowledge of filesystem structures.


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