DF

Section: User Commands (1)
Updated: December 2009
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NAME

df - report file system disk space usage

SYNOPSIS

df [OPTION]... [FILE]...

DESCRIPTION

This manual page documents the GNU version of df. df displays the amount of disk space available on the file system containing each file name argument. If no file name is given, the space available on all currently mounted file systems is shown. Disk space is shown in 1K blocks by default, unless the environment variable POSIXLY_CORRECT is set, in which case 512-byte blocks are used.

If an argument is the absolute file name of a disk device node containing a mounted file system, df shows the space available on that file system rather than on the file system containing the device node (which is always the root file system). This version of df cannot show the space available on unmounted file systems, because on most kinds of systems doing so requires very nonportable intimate knowledge of file system structures.

OPTIONS

Show information about the file system on which each FILE resides, or all file systems by default.

Mandatory arguments to long options are mandatory for short options too.

-a, --all: include dummy file systems
-B, --block-size=SIZE: use SIZE-byte blocks
--total: produce a grand total
-h, --human-readable: print sizes in human readable format (e.g., 1K 234M 2G)
-H, --si: likewise, but use powers of 1000 not 1024
-i, --inodes: list inode information instead of block usage
-k: like --block-size=1K
-l, --local: limit listing to local file systems
--no-sync: do not invoke sync before getting usage info (default)
-P, --portability: use the POSIX output format
--sync: invoke sync before getting usage info
-t, --type=TYPE: limit listing to file systems of type TYPE
-T, --print-type: print file system type
-x, --exclude-type=TYPE: limit listing to file systems not of type TYPE
-v: (ignored)
--help: display this help and exit
--version: output version information and exit

Display values are in units of the first available SIZE from --block-size, and the DF_BLOCK_SIZE, BLOCK_SIZE and BLOCKSIZE environment variables. Otherwise, units default to 1024 bytes (or 512 if POSIXLY_CORRECT is set).

SIZE may be (or may be an integer optionally followed by) one of following: KB 1000, K 1024, MB 1000*1000, M 1024*1024, and so on for G, T, P, E, Z, Y.

AUTHOR

Written by Torbjorn Granlund, David MacKenzie, and Paul Eggert.

REPORTING BUGS

Report df bugs to bug-coreutils@gnu.org
GNU coreutils home page: <http://www.gnu.org/software/coreutils/>
General help using GNU software: <http://www.gnu.org/gethelp/>

COPYRIGHT

Copyright © 2009 Free Software Foundation, Inc. License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>.
This is free software: you are free to change and redistribute it. There is NO WARRANTY, to the extent permitted by law.

DF