DF
Section: User Commands (1)
Updated: April 29, 1985
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NAME
df - report free disk space on file systems
SYNOPSIS
df
[
-i
] [ filesystem ... ] [ file ... ]
[
-t type
] [ filesystem ... ] [ filename ... ]
DESCRIPTION
df
displays the amount of disk space occupied by currently mounted file systems,
the amount of used and available space,
and how much of the file system's total capacity has been used.
Used without arguments, df reports on all mounted file systems,
producing something like:
-
tutorial% df
Filesystem kbytes used avail capacity Mounted on
/dev/ip0a 7445 4714 1986 70% /
/dev/ip0g 42277 35291 2758 93% /usr
Note that used+avail is less than the amount of space in the file system
(kbytes); this is because the system reserves a fraction of the space
in the file system to allow its file system allocation routines to work well.
The amount reserved is typically about 10%; this may be adjusted using
tunefs.
When all the space on a file system except for this reserve is
in use, only the super-user can allocate new files and data blocks
to existing files. When a file system is overallocated in this way,
df
may report that the file system is more than 100% utilized.
If arguments to df are disk partitions (for example, /dev/ip0a)
or UNIX path names, df produces a report on the
file system containing the named file. Thus "df ."
shows the amount of space on the file system containing the current
directory.
OPTIONS
- -i
-
Also report the number of inodes which are used and free.
This option is only meaningful for local file systems, since the NFS
protocol does not support it.
- -t type
-
Report on filesystems of a given
type
(for example, nfs or 4.2).
FILES
/etc/mtab list of currently mounted filesystems
SEE ALSO
du(1V), mtab(5), quot(8), tunefs(8)
Index
- NAME
-
- SYNOPSIS
-
- DESCRIPTION
-
- OPTIONS
-
- FILES
-
- SEE ALSO
-
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