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df
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slightly out of date.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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发表于 2009-05-27 09:58
发表于 2009-05-27 09:59
