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df
Name
df - displays number of free disk blocks and free files
Synopsis
df [-F FSType] [-abeghklntPVvZ]
[-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 dev-
ice, 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
The following options are supported:
-a
Reports on all file systems including ones whose entries
in /etc/mnttab (see mnttab(4)) 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(4)) by matching the directory,
block_device, or resource with an entry in the table, or
by consulting /etc/default/fs. See default_fs(4).
-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 and may not be used together with the
-v option.
-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.
-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.
-P
Same as -h except in 512-byte units.
-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.
-v
Like -k, except that sizes are displayed in multiples of
the smallest block size supported by each specified file
system.
This option may not be used with the -k option.
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
-Z
Displays mounts in all visible zones. By default, df
displays mounts located only within the current zone.
This option has no effect in a non-global zone.
Operands
The df utility interprets operands according to the follow-
ing precedence: block_device, directory, file, resource. 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(5) 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(7FS)) 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
When set, any header which normally displays files will now
display nodes. See environ(5) for descriptions of the fol-
lowing 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
See attributes(5) for descriptions of the following attri-
butes:
tab() box; cw(2.75i) |cw(2.75i) lw(2.75i) |lw(2.75i) ATTRI-
BUTE TYPEATTRIBUTE VALUE _ Availabilitysystem/core-os _
Interface StabilityCommitted _ StandardSee standards(5).
See Also
find(1), df_ufs(1M), mount(1M), statvfs(2), default_fs(4),
mnttab(4), vfstab(4), attributes(5), environ(5), largefile(5),
standards(5), objfs(7FS)
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.