Man df command in linux

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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.

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Show information about the file system on which each FILE resides, or all file systems by default. Every week, as time allows, I will publish articles on the ~ 90 commands geared toward Linux sysadmins and Linux power users.

Use the df command when you need to know how much space is available on a particular file system or to see an overview of mounted files systems.

 

df command in Linux and other Unix-like systems.

The df command (short for disk free) is used to show the amount of free disk space available on Linux and other Unix-like systems and to understand the filesystems that have been mounted.

displays the amount of free space on the file system containing each file name argument.

FIELD_LIST is a comma-separated list of columns to be included. Space is shown in 1K blocks by default, unless the environment variable POSIXLY_CORRECT is set, in which case 512-byte blocks are used. Units are K,M,G,T,P,E,Z,Y,R,Q (powers of 1024) or KB,MB,... df displays the amount of space available on the file system containing each file name argument.

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Pages that refer to this page: fstab(5),  tmpfs(5),  findmnt(8),  xfs_quota(8)

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

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This page is part of the coreutils (basic file, shell and text manipulation utilities) project.

FIELD_LIST is a comma-separated list of columns to be included. There is NO WARRANTY, to the extent permitted by law. 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.

This page was obtained from the tarball coreutils-9.7.tar.xz fetched from ⟨http://ftp.gnu.org/gnu/coreutils/⟩ on 2025-08-11. This is free software: you are free to change and redistribute it.

man df command in linux

[FILE]... 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. The SIZE argument is an integer and optional unit (example: 10K is 10*1024). If no file name is given, the space available on all currently mounted file systems is shown.

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. -a, --all include pseudo, duplicate, inaccessible 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 --direct show statistics for a file instead of mount point -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.

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