df - displays number of free disk blocks and free files
/usr/bin/df [-F FSType] [-abeghklmnPtVvZ]
[-o FSType-specific_options]
[block_device | directory | file | resource ...]
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.
-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 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.
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.
See largefile(7) for the description of the behavior of df when
encountering files greater than or equal to 2 Gbyte ( 2^31 bytes).
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
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.
The following exit values are returned:
0
Successful completion.
>0
An error occurred.
/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
See attributes(7) for descriptions of the following attributes:
| ATTRIBUTE
TYPE |
ATTRIBUTE VALUE |
| Interface Stability |
Standard |
find(1), statvfs(2), objfs(4FS), default_fs(5),
mnttab(5), vfstab(5), attributes(7), environ(7),
largefile(7), standards(7), df_ufs(8), mount(8)
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.