df.1

早期freebsd实现

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.\"     @(#)df.1	8.2 (Berkeley) 1/13/94
.\"
.Dd January 13, 1994
.Dt DF 1
.Os BSD 4
.Sh NAME
.Nm df
.Nd display free disk space
.Sh SYNOPSIS
.Nm df
.Op Fl in
.Op Fl t Ar type
.Op Ar file | Ar filesystem ...
.Sh DESCRIPTION
.Nm Df
displays statistics about the amount of free disk space on the specified
.Ar filesystem
or on the filesystem of which
.Ar file
is a part.
Values are displayed in 512-byte per block block counts.
If neither a file or a filesystem operand is specified,
statistics for all mounted filesystems are displayed
(subject to the
.Fl t
option below).
.Pp
The following options are available:
.Bl -tag -width Ds
.It Fl i
Include statistics on the number of free inodes.
.It Fl n
Print out the previously obtained statistics from the filesystems.
This option should be used if it is possible that one or more
filesystems are in a state such that they will not be able to provide
statistics without a long delay.
When this option is specified,
.Nm df
will not request new statistics from the filesystems, but will respond
with the possibly stale statistics that were previously obtained.
.It Fl t
Only print out statistics for filesystems of the specified types.
The recognized types are:
ufs, nfs, mfs, lfs, msdos, fdesc, portal, kernfs, procfs, afs and isofs.
along with the aggregates:
all (the default),
local (ufs, mfs, lfs, msdos, isofs),
and misc (fdesc, portal, kernfs, procfs).
The string ``no'' may be prepending to a type to get its complement
(e.g. ``nonfs'' to get non-NFS filesystems).  The first
.Fl t
option overrides the default, additional such options will add to
(or subtract from) the current set of types; e.g. either
``df -t ufs -t lfs''
or
``df -t local -t nomfs''
will display statistics for UFS and LFS filesystems.
.El
.Sh ENVIRONMENTAL VARIABLES
.Bl -tag -width BLOCKSIZE
.It Ev BLOCKSIZE
If the environmental variable
.Ev BLOCKSIZE
is set, the block counts will be displayed in units of that size block.
.El
.Sh BUGS
The
.Fl n
and
.Fl t
flags are ignored if a file or filesystem is specified.
.Sh SEE ALSO
.Xr quota 1 ,
.Xr statfs 2 ,
.Xr fstatfs 2 ,
.Xr getfsstat 2 ,
.Xr getmntinfo 3 ,
.Xr fstab 5 ,
.Xr mount 8 ,
.Xr quot 8
.Sh HISTORY
A
.Nm df
command appeared in
.At v6 .