df - report free disk space on file systems
df [ -a ] [ -i ] [ -t type ] [ filesystem... ] [ filename... ]
SYSTEM V SYNOPSIS
/usr/5bin/df [ -t ] [ filesystem... ] [ filename... ]
The System V version of this command is available with the System V
software installation option. Refer to for information on how to
install optional software.
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:
Filesystem kbytes used avail capacity Mounted on
/dev/ip0a 7445 4714 1986 70% /
/dev/ip0g 42277 35291 2758 93% /usr
Note: 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(8). 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/ip0as or 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 con-
taining the current directory.
SYSTEM V DESCRIPTION
The System V version of df works in the same manner as above but prints
only the amount of available space (in 512 byte units) and the number
of free inodes.
-a Report on all filesystems including the uninteresting ones which
have zero total blocks. (that is, automounter)
-i Report the number of used and free inodes. Print `*' if no
information is available.
Report on filesystems of a given type (for example, nfs or 4.2).
SYSTEM V OPTIONS
-t Report the total allocated space figures.
/etc/mtab List of filesystems currently mounted.
du(1V), mtab(5), quot(8), tunefs(8)
16 September 1989 DF(1V)