NAME

df − report free disk space on file systems

SYNOPSIS

df [ −a ] [ −i ] [ −t type ] [ filesystem... ] [ filename... ]

DESCRIPTION

df prints out the amount of used and available disk space on the specified filesystem, e.g. “/dev/rp0a”, or on the filesystem in which the specified file, is contained.  If no file system is specified, the values for all the normally mounted file systems are printed.  The reported numbers are in kilobytes.  Used without arguments, df reports on all mounted file systems, producing something like:

tutorial% df
Filesystemkbytes  usedavailcapacityMounted on
/dev/sd0a 72661 2838637008     43%/
oak:/source54693247439317845     96%/source

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

−a Reports on all filesystems including the uninteresting ones which have zero total blocks. (e.g.  automounter )

−i Report also the number of inodes which are used and free. 

−t type
Report on filesystems of a given type (for example, nfs or 4.3). 

FILES

/etc/mtablist of currently mounted filesystems

SEE ALSO

du(1V), mtab(5), quot(8), tunefs(8)

4th Berkeley Distribution  —  Revision 1.5 of 01/07/90