Updated: 2022/Sep/29
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DF(1) General Commands Manual DF(1)
NAME
df - display free disk space
SYNOPSIS
df [-aclnW] [-G | -bkP | -bfgHhikmN] [-t type] [file | file_system]...
DESCRIPTION
df displays statistics about the amount of free disk space on the
specified file_system or on the file system of which file is a part. By
default, all sizes are reported in 512-byte block counts. If neither a
file or a file_system operand is specified, statistics for all mounted,
and not hidden (i.e.: not mounted with MNT_IGNORE), file systems are
displayed (subject to the -a, -l and -t options below).
Note that the printed count of available blocks takes minfree into
account, and thus will be negative when the number of free blocks on the
file system is less than minfree.
The following options are available:
-a If no file, or file_system arguments are givem, show all mount
points, including those that were mounted with the MNT_IGNORE
flag. Note that for file systems specified on the command line,
that mount option is never considered.
-b Show space as units of basic blocks (512 bytes). This is
normally the default; this option can be used to override a
conflicting setting in the environment variable BLOCKSIZE.
-c Display a grand total for all shown mount points. When combined
with -f only the total for the mount points which otherwise would
be included is shown, not the individual entries.
-f Display only the available free space (or with -i, free inodes)
in a minimal format. When there is to be only one line of
output, only the value is shown, otherwise the value and the
mount point, separated by a single space, are printed. For free
space, the -b, -g, -H, -h, -k and -m options, and BLOCKSIZE are
all used as normal. This option implies -N and is incompatible
with -P and -G.
-G Display all the fields of the structure(s) returned by
statvfs(2). This option cannot be used with the -f, -i or -P
options, and is modelled after the Solaris -g option. This
option will override the -b, -g, -H, -h, -k and -m options, as
well as any setting of BLOCKSIZE.
-g The -g option causes size numbers to be reported in gigabytes
(1024*1024*1024 bytes).
-h Use "human-readable" output for space data. Use unit suffixes:
Byte, Kilobyte, Megabyte, Gigabyte, Terabyte, Petabyte, Exabyte
in order to reduce the number of digits to four or less.
-H As with -h but using powers of 10 (1000) rather than 2 (1024).
-i Include statistics on the number of free inodes. When combined
with -f only the number of free inodes is shown.
-k By default, all sizes are reported in 512-byte block counts,
unless the BLOCKSIZE environment variable is set. The -k option
causes the size numbers to be reported in kilobytes (1024 bytes).
-l Display statistics only about mounted file systems with the
MNT_LOCAL flag set. If a non-local file system is given as an
argument, a warning is issued and no information is given on that
file system.
-m The -m option causes size numbers to be reported in megabytes
(1024*1024 bytes).
-N Suppress the header line normally output. This option is ignored
with -G which has no header line to ignore, and with -P which
requires the header line to maintain the portable format it is
designed to emulate.
-n Print out the previously obtained statistics from the file
systems. This option should be used if it is possible that one
or more file systems are in a state such that they will not be
able to provide statistics without a long delay. When this
option is specified, df will not request new statistics from the
file systems, but will respond with the possibly stale statistics
that were previously obtained.
-P Produce output in the following portable format:
The output will be preceded by the following header line:
"Filesystem <blksize>-blocks Used Available Capacity Mounted on\n"
The header line is followed by data formatted as follows:
"%s %d %d %d %d%% %s\n", <file system name>, <total space>,
<space used>, <space free>, <percentage used>,
<file system root>
Note that the -i option may not be specified with -P, and the
blksize is required to be 512 or 1024.
-t type
Is used to indicate the actions should only be taken on file
systems of the specified type. More than one type may be
specified in a comma-separated list. The list of file system
types can be prefixed with "no" to specify the file system types
for which action should not be taken. If a file system is given
on the command line that is not of the specified type, a warning
is issued and no information is given on that file system.
-W Print the wedge name instead of the mounted from device for
wedges. The wedge name is prefixed with "NAME=" as in fstab(5).
If the wedge information cannot be obtained for one or more file
systems, the -W option is silently ignored for those file
systems.
If more than one of -b, -g, -H, -h, -k or -m is given, the last of those
specified is used.
ENVIRONMENT
BLOCKSIZE If the environment variable BLOCKSIZE is set, and none of the
-b, -g, -H, -h, -k and -m options are specified, the block
counts will be displayed in units of that size block.
SEE ALSO
quota(1), fstatvfs(2), getvfsstat(2), statvfs(2), getbsize(3),
getmntinfo(3), humanize_number(3), fs(5), fstab(5), mount(8), quot(8),
tunefs(8)
HISTORY
A df utility appeared in Version 1 AT&T UNIX. The -f option was added in
NetBSD 10.
NetBSD 10.99 August 8, 2022 NetBSD 10.99