DF(1B) BSD Compatibility Package Commands DF(1B)


df - display status of disk space on file systems


/usr/ucb/df [-a] [-i] [-t type] [filesystem...]


The df utility 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.

If arguments to df are 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.


The following options are supported:

Report on all filesystems including the uninteresting ones
which have zero total blocks (that is, auto-mounter).

Report the number of used and free inodes. Print ` * ' if no
information is available.

-t type
Report on filesystems of a given type (for example, nfs or


Example 1: Using df

A sample of output for df looks like:

example% df
Filesystem kbytes used avail capacity Mounted on
sparky:/ 7445 4714 1986 70% /
sparky:/usr 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 can be adjusted
using tunefs (see tunefs(1M)). 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 can report that the file system is more than 100% utilized.


List of file systems currently mounted

List of default parameters for each file system


du(1), quot(1M), tunefs(1M), mnttab(4), attributes(5)

September 14, 1992 DF(1B)