illumos: manual page: df.8

DF(8) Maintenance Commands and Procedures DF(8)

NAME

df - displays number of free disk blocks and free files

SYNOPSIS

/usr/bin/df [-F FSType] [-abeghklmnPtVvZ]
[-o FSType-specific_options]
[block_device | directory | file | resource ...]

DESCRIPTION

The df utility displays the amount of disk space occupied by mounted or
unmounted file systems, the amount of used and available space, and how
much of the file system's total capacity has been used. The file system
is specified by device, or by referring to a file or directory on the
specified file system.

Used without operands or options, df reports on all mounted file systems.

df may not be supported for all FSTypes.

If df is run on a networked mount point that the automounter has not yet
mounted, the file system size will be reported as zero. As soon as the
automounter mounts the file system, the sizes will be reported correctly.

OPTIONS

-a

Reports on all file systems including ones whose entries in
/etc/mnttab (see mnttab(5)) have the ignore option set.

-b

Prints the total number of kilobytes free.

-e

Prints only the number of files free.

-F FSType

Specifies the FSType on which to operate. The -F option is intended
for use with unmounted file systems. The FSType should be specified
here or be determinable from /etc/vfstab (see vfstab(5)) by matching
the directory, block_device, or resource with an entry in the table,
or by consulting /etc/default/fs. See default_fs(5).

-g

Prints the entire statvfs(2) structure. This option is used only for
mounted file systems. It can not be used with the -o option. This
option overrides the -b, -e, -k, -n, -P, and -t options.

-h

Like -k, except that sizes are in a more human readable format. The
output consists of one line of information for each specified file
system. This information includes the file system name, the total
space allocated in the file system, the amount of space allocated to
existing files, the total amount of space available for the creation
of new files by unprivileged users, and the percentage of normally
available space that is currently allocated to all files on the file
system. All sizes are scaled to a human readable format, for example,
14K, 234M, 2.7G, or 3.0T. Scaling is done by repetitively dividing by
1024.

This option overrides the -b, -e, -g, -k, -n, -t, and -V options.
This option only works on mounted filesystems and can not be used
together with -o option.

-k

Prints the allocation in kbytes. The output consists of one line of
information for each specified file system. This information includes
the file system name, the total space allocated in the file system,
the amount of space allocated to existing files, the total amount of
space available for the creation of new files by unprivileged users,
and the percentage of normally available space that is currently
allocated to all files on the file system. This option overrides the
-b, -e, -n, and -t options.

-l

Reports on local file systems only. This option is used only for
mounted file systems. It can not be used with the -o option.

-m

Like -k, except prints the allocation in mbytes.

-n

Prints only the FSType name. Invoked with no operands, this option
prints a list of mounted file system types. This option is used only
for mounted file systems. It can not be used with the -o option.

-o FSType-specific_options

Specifies FSType-specific options. These options are comma-separated,
with no intervening spaces. See the manual page for the FSType-
specific command for details.

-t

Prints full listings with totals. This option overrides the -b, -e,
and -n options.

-V

Echoes the complete set of file system specific command lines, but
does not execute them. The command line is generated by using the
options and operands provided by the user and adding to them
information derived from /etc/mnttab, /etc/vfstab, or
/etc/default/fs. This option may be used to verify and validate the
command line.

-Z

Displays mounts in all visible zones. By default, df only displays
mounts located within the current zone. This option has no effect in
a non-global zone.

-v

Like -k, except that sizes are displayed in multiples of the smallest
block size supported by each specified file system.

The output consists of one line of information for each file system.
This one line of information includes the following:

o the file system's mount point

o the file system's name

o the total number of blocks allocated to the file system

o the number of blocks allocated to existing files

o the number of blocks available for the creation of new
files by unprivileged users

o the percentage of blocks in use by files

-P

Same as -h except in 512-byte units.

OPERANDS

The df utility interprets operands according to the following precedence:
block_device, directory, file. The following operands are supported:

block_device

Represents a block special device (for example, /dev/dsk/c1d0s7).

directory

Represents a valid directory name. df reports on the file system that
contains directory.

file

Represents a valid file name. df reports on the file system that
contains file.

resource

Represents an NFS resource name.

USAGE

See largefile(7) for the description of the behavior of df when
encountering files greater than or equal to 2 Gbyte ( 2^31 bytes).

EXAMPLES

Example 1: Executing the df command

The following example shows the df command and its output:

example% /usr/bin/df

/ (/dev/dsk/c0t0d0s0 ): 287530 blocks 92028 files
/system/contract (ctfs ): 0 blocks 2147483572 files
/system/object (objfs ): 0 blocks 2147483511 files
/usr (/dev/dsk/c0t0d0s6 ): 1020214 blocks 268550 files
/proc (/proc ): 0 blocks 878 files
/dev/fd (fd ): 0 blocks 0 files
/etc/mnttab (mnttab ): 0 blocks 0 files
/var/run (swap ): 396016 blocks 9375 files
/tmp (swap ): 396016 blocks 9375 files
/opt (/dev/dsk/c0t0d0s5 ): 381552 blocks 96649 files
/export/home (/dev/dsk/c0t0d0s7 ): 434364 blocks 108220 files

where the columns represent the mount point, device (or "filesystem",
according to df -k), free blocks, and free files, respectively. For
contract file systems, /system/contract is the mount point, ctfs is the
contract file system (used by SMF) with 0 free blocks and
2147483582(INTMAX-1) free files. For object file systems, /system/object
is the mount point, objfs is the object file system (see objfs(4FS)) with
0 free blocks and 2147483511 free files.

Example 2: Writing Portable Information About the /usr File System

The following example writes portable information about the /usr file
system:

example% /usr/bin/df -P /usr

Example 3: Writing Portable Information About the /usr/src file System

Assuming that /usr/src is part of the /usr file system, the following
example writes portable information :

example% /usr/bin/df -P /usr/src

Example 4: Using df to Display Inode Usage

The following example displays inode usage on all ufs file systems:

example%/usr/bin/df -F ufs -o i

ENVIRONMENT VARIABLES

See environ(7) for descriptions of the following environment variables
that affect the execution of df: LANG, LC_ALL, LC_CTYPE, LC_MESSAGES, and
NLSPATH.

EXIT STATUS

The following exit values are returned:

0

Successful completion.

>0

An error occurred.

FILES

/dev/dsk/*

Disk devices

/etc/default/fs

Default local file system type. Default values can be set for the
following flags in /etc/default/fs. For example: LOCAL=ufs, where
LOCAL is the default partition for a command if no FSType is
specified.

/etc/mnttab

Mount table

/etc/vfstab

List of default parameters for each file system

ATTRIBUTES

NOTES

If UFS logging is enabled on a file system, the disk space used for the
log is reflected in the df report. The log is allocated from free blocks
on the file system, and it is sized approximately 1 Mbyte per 1 Gbyte of
file system, up to 256 Mbytes. The log size may be larger (up to a
maximum of 512 Mbytes) depending on the number of cylinder groups
present in the file system.

April 14, 2016 DF(8)