df Command

Purpose:

Reports information about space on file systems. This document describes the
AIX df command as well as the System V version of df.

Syntax:

df [ [ -P ] | [ -I | -M | -i | -t | -v ] ] [ -k ] [ -m ] [ -g ] [ -s ]
[FileSystem ... | File... ]

Description:

The df command displays information about total space and available space on a
file system. The FileSystem parameter specifies the name of the device on which
the file system resides, the directory on which the file system is mounted, or
the relative path name of a file system. The File parameter specifies a file or
a directory that is not a mount point. If the File parameter is specified, the
df command displays information for the file system on which the file or
directory resides. If you do not specify the FileSystem or File parameter, the
df command displays information for all currently mounted file systems. File
system statistics are displayed in units of 512-byte blocks by default.

The df command gets file system space statistics from the statfs system call.
However, specifying the -s flag gets the statistics from the virtual file
system (VFS) specific file system helper. If you do not specify arguments with
the -s flag and the helper fails to get the statistics, the statfs system call
statistics are used. Under certain exceptional conditions, such as when a file
system is being modified while the df command is running, the statistics
displayed by the df command might not be accurate.
Note: Some remote file systems, such as the Network File System (NFS), do not
provide all the information that the df command needs. The df command prints
blanks for statistics that the server does not provide.

Flags:

-g Displays statistics in units of GB blocks. The output values for the file
system statistics would be in floating point numbers as value of each unit in
bytes is significantly high.

-i Displays the number of free and used i-nodes for the file system; this
output is the default when the specified file system is mounted.

-I Displays information on the total number of blocks, the used space, the free
space, the percentage of used space, and the mount point for the file system.

-k Displays statistics in units of 1024-byte blocks.

-m Displays statistics in units of MB blocks. The output values for the file
system statistics would be in floating point numbers as value of each unit in
bytes is significantly high.

-M Displays the mount point information for the file system in the second
column.

-P Displays information on the file system in POSIX portable format.

When the -P flag is specified, the header line appears similar to:

Filesystem 512-blocks Used Available Capacity Mounted on\n

If the -k, -m or -g flag is specified in addition to the -P flag, the column
heading 512-blocks is replaced by the respective units, depending on which of
these flags is used with the -P flag.

File system statistics are displayed on one line in the following order:

FileSystem, TotalSpace, UsedSpace, FreeSpace, UsedPercentage, MountPoint

-s Gets file system statistics from the VFS specific file system helper instead
of the statfs system call. Any arguments given when using the -s flag must be a
JFS or Enhanced JFS filesystem mount point or device. The filesystem must also
be listed in /etc/filesystems.

-t Includes figures for total allocated space in the output.

-v Displays all information for the specified file system.

The values of the output parameters with the flags -m and -g would be rounded
off to nearest second decimal digit. If all or any two of the -k, -m and -g
flags are specified, the last one specified takes effect.

Exit Status

This command returns the following exit values:

0 Successful completion.

>0 An error occurred.

Examples:

1. To display information about all mounted file systems, enter:

df

If your system has the /, /usr, /site, and /usr/venus file systems
mounted, the output from the df command resembles the following:
Filesystem 512-blocks Free %Used Iused %Iused Mounted on

/dev/hd0 19368 9976 48% 4714 5% /

/dev/hd1 24212 4808 80% 5031 19% /usr

/dev/hd2 9744 9352 4% 1900 4% /site

/dev/hd3 3868 3856 0% 986 0% /usr/venus

2. To display information about /test file system in 1024-byte blocks, enter:
df -k /test

Filesystem 1024 blocks Free %Used Iused %Iused Mounted on

/dev/lv11 16384 15824 4% 18 1% /tmp/ravi1

This displays the file system statistics in 1024-byte disk blocks.
3. To display information about /test file system in MB blocks, enter:
df -m /test

Filesystem MB blocks Free %Used Iused %Iused Mounted on

/dev/lv11 16.00 15.46 4% 18 1% /tmp/ravi1

This displays file system statistics in MB disk blocks rounded off to
nearest 2nd decimal digit.
4. To display information about the /test file system in GB blocks, enter:
df -g /test

Filesystem GB blocks Free %Used Iused %Iused Mounted on

/dev/lv11 0.02 0.02 0% 18 1% /tmp/ravi1

This displays file system statistics in GB disk blocks rounded off to
nearest 2nd decimal digit.
5. To display available space on the file system in which your current
directory resides, enter:

cd/

df .

The output from this command resembles the following:
Device 512-blocks free %used iused %iused Mounted on

/dev/hd4 19368 9976 48% 4714 5% /

Files

/etc/filesystems Lists the known file systems and defines their
characteristics.

/etc/vfs Contains descriptions of virtual file system types.

Related Information

The fsck command.

The filesystems file.

The File Systems Overview for System Management in AIX 5L Version 5.2 System
Management Concepts: Operating System and Devices explains file system types,
management, structure, and maintenance.

The Mounting Overview in AIX 5L Version 5.2 System Management Concepts:
Operating System and Devices explains mounting files and directories, mount
points, and automatic mounts.

System V df Command

Purpose:

Reports number of free disk blocks and files.

Syntax:

/usr/sysv/bin/df [ -a ] [ -l ] [ [ [ -e ] [-g ] [ -n ] ] | [ [ -i ] [ -v ] ] |
-t ] ] [FileSystem ...] [File ...]

Description:

The df command displays information about total space and available space on a
file system. File system statistics are displayed in units of 512-byte blocks

Flags:

-a Performs the default operation and prints the mount point, the device name,
number of free blocks and number of used inodes (files).

-e Print only the number of free files.

-g Print the entire statvfs structure. This option overrides the -a , -e, -i,
-n, -t and -v options. The numbers for available, total, and free blocks are
reported in 512 byte blocks.

-i Displays the total number of inodes, the number of free inodes, the number
of used inodes, and the percentage of inodes in use.

-l Reports on local file systems only.

-n Prints the type of filesystem.

-t Causes total allocated block figures to be reported.

-v Reports percent of blocks used as well as the number of blocks used and
free.

Parameters:

File The File parameter specifies a file or a directory that is not a mount
point. If the File parameter is specified, the df command displays information
for the file system on which the file or directory resides.

FileSystem The FileSystem parameter specifies the name of the device on which
the file system resides, the directory on which the file system is mounted, or
the relative path name of a file system.
Note: If the FileSystem or File parameter is not specified, the df command
displays information for all currently mounted file systems.

Exit Status

0
The command completed successfully
>0
An error occurred.

Examples:

1. To display information about all mounted file systems, enter:
/usr/sysv/bin/df

The output looks similar to the following:
/ (/dev/hd4 ): 19656 blocks 1504 files

/usr (/dev/hd2 ): 1139904 blocks 20254 files

/var (/dev/hd9var ): 23096 blocks 512 files

/tmp (/dev/hd3 ): 2464 blocks 204 files

/home (/dev/hd1 ): 44208 blocks 146 files

/proc (/proc ): 0 blocks 0 files

/opt (/dev/hd10opt ): 13880 blocks 310 files

2. To display information about the file system in which your current
directory resides, enter:
/usr/sysv/bin/df .

3. To display the total number of inode, the number of free inodes and the
number of available inodes in all mounted file systems, enter:
/usr/sysv/bin/df -i

The output looks similar to the following:
Mount Dir Filesystem iused avail itotal %iused

/ /dev/hd4 1504 6688 8192 19%

/usr /dev/hd2 20254 127202 147456 14%

/var /dev/hd9var 512 3584 4096 13%

/tmp /dev/hd3 204 5940 6144 4%

/home /dev/hd1 146 14190 14336 2%

/proc /proc 0 0 0 0

/opt /dev/hd10opt 310 5834 6144 6%

4. To display the total number of blocks , the number of used blocks and the
number of free blocks on a the /tmp file system, enter:
/usr/sysv/bin/df -v /tmp

5. To display the type of filesystem, enter:
/usr/sysv/bin/df -n

6. To display inode information on all local filesystems, enter:
/usr/sysv/bin/df -i -l

7. To display the statvfs structure information on all the filesystems,
enter:
/usr/sysv/bin/df -g

8. To display the number of free files on filesystems, enter:
/usr/sysv/bin/df -e