DF(1)

NAME
df - report file system space usage

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

DESCRIPTION
This manual page documents the GNU version of df. df displays the amount of 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. 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 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. This version of df cannot show the space available on unmounted file systems, because on most kinds of systems doing so requires non-portable 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 pseudo, duplicate, inaccessible file systems

-B, --block-size=SIZE
    scale sizes by SIZE before printing them; see SIZE format below; E.g., '-BM' prints sizes in units of 1,048,576 bytes

-h, --human-readable
    print sizes in powers of 1024 (e.g., 1023M)

-H, --si
    print sizes in powers of 1000 (e.g., 1.1G)

-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)

--output[=FIELD_LIST]
    use the output format defined by FIELD_LIST, or print all fields if FIELD_LIST is omitted

-P, --portability
    use the POSIX output format

--sync
    invoke sync before getting usage info

--total
    elide all entries insignificant to available space, and produce a grand total

-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).

The SIZE argument is an integer and optional unit (example: 10K is 10*1024). Units are K,M,G,T,P,E,Z,Y,R,Q (powers of 1024) or KB,MB,... (powers of 1000). Binary prefixes can be used, too: KiB=K, MiB=M, and so on.

FIELD_LIST is a comma-separated list of columns to be included. Valid field names are: 'source', 'fstype', 'itotal', 'iused', 'iavail', 'ipcent', 'size', 'used', 'avail', 'pcent', 'file' and 'target' (see info page).

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

REPORTING BUGS
Report bugs to: bug-coreutils@gnu.org
GNU coreutils home page: <https://www.gnu.org/software/coreutils/>
General help using GNU software: <https://www.gnu.org/gethelp/>
Report any translation bugs to <https://translationproject.org/team/>

COPYRIGHT
Copyright © 2026 Free Software Foundation, Inc. License GPLv3+: GNU GPL version 3 or later <https://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.

SEE ALSO
Full documentation <https://www.gnu.org/software/coreutils/df>
or available locally via: info '(coreutils) df invocation'