df(1M) MISC. REFERENCE MANUAL PAGES df(1M)
NAME
df (ufs) - report free disk space on ufs file systems
SYNOPSIS
df [ -F ufs ] [ generic_options ] [ -o i ] [directory | spe-
cial]
DESCRIPTION
generic_options are options supported by the generic df com-
mand.
df displays the amount of disk space occupied by ufs file
systems, the amount of used and available space, and how
much of the file system's total capacity has been used.
Note that the amount of space reported as used and available
is less than the amount of space in the file system; 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(1M). When all the space on the
file system except for this reserve is in use, only the
super-user can allocate new files and data blocks to exist-
ing files. When the file system is overallocated in this
way, df may report that the file system is more than 100%
utilized. The options are:
-F ufs
Specifies the ufs-FSType.
-o Specify ufs file system specific options. The avail-
able option is:
i Report the number of used and free inodes. May
not be used with generic_options.
NOTES
df calculates its results differently for mounted and
unmounted file systems. For unmounted systems the numbers
reflect the 10% reservation mentioned above. For this rea-
son, the available space reported by the generic command may
differ from the available space reported by this module.
The -b and -e options override the -t option.
FILES
/etc/mnttab list of file systems currently mounted
SEE ALSO
generic df(1M), du(1M), quot(1M), tunefs(1M), mnttab(4)
Last change: UFS 1