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man pages section 8: System Administration Commands

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Updated: Thursday, June 13, 2019
 
 

df(8)

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 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

The following options are supported:

–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 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:

  • the file system's mount point

  • the file system's name

  • the total number of blocks allocated to the file system

  • the number of blocks allocated to existing files

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

  • 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 following 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.

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

When set, any header which normally displays files will now display nodes. 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

See attributes(7) for descriptions of the following attributes:

ATTRIBUTE TYPE
ATTRIBUTE VALUE
Availability
system/core-os
Interface Stability
Committed
Standard

See Also

find(1), statvfs(2), objfs(4FS), default_fs(5), mnttab(5), vfstab(5), attributes(7), environ(7), standards(7), df_ufs(8), mount(8)

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.

In previous releases of Solaris, there was a /usr/ucb/df command which had some differences from the df command described here. There are semantic differences with the –t and –i options. The –t option of /usr/ucb/df refers to the file system type, while the –t option for the df described here prints full listings with totals. The –i option of /usr/ucb/df is equivalent to the –o i option of df.