Manual Reference Pages  - DF (1)


df - report file system disk space usage




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


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.


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
  scale sizes by SIZE before printing them. E.g., ‘-BM’ prints sizes in units of 1,048,576 bytes. See SIZE format below.
--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
  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.


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


Report df bugs to
GNU coreutils home page: <>
General help using GNU software: <>
Report df translation bugs to <>


Copyright © 2011 Free Software Foundation, Inc. License GPLv3+: GNU GPL version 3 or later <>.
This is free software: you are free to change and redistribute it. There is NO WARRANTY, to the extent permitted by law.


The full documentation for df is maintained as a Texinfo manual. If the info and df programs are properly installed at your site, the command
info coreutils df invocation
should give you access to the complete manual.

GNU coreutils 8.12.197-032bb DF (1) September 2011
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