DF(1) BSD Reference Manual DF(1)
df - display free disk space
df [-iklnP] [-t type] [[file | file_system] ...]
The df utility displays statistics about the amount of free disk space on the specified file_system or on the file system of which file is a part. By default, values are displayed as 512-byte block counts. If neither a file nor a file_system operand is specified, statistics for all mounted file systems are displayed (subject to the -l and -t options below). The options are as follows: -i Include statistics on the number of free inodes. -k By default, all sizes are reported in 512-byte block counts. The -k option causes the numbers to be reported in kilobyte counts. -l Display statistics only about mounted file systems with the MNT_LOCAL flag set. If a non-local file system is given as an ar- gument, a warning is issued and no information is given on that file system. -n Print out the previously obtained statistics from the file sys- tems. This option should be used if it is possible that one or more file systems are in a state such that they will not be able to provide statistics without a long delay. When this option is specified, df will not request new statistics from the file sys- tems, but will respond with the possibly stale statistics that were previously obtained. -P Print out information in a stricter format designed to be parsed by portable scripts. -t type Indicate the actions should only be taken on file systems of the specified type. More than one type may be specified in a comma- separated list. The list of file system types can be prefixed with "no" to specify the file system types for which action should not be taken. If a file system is given on the command line that is not of the specified type, a warning is issued and no information is given on that file system.
BLOCKSIZE If the environment variable BLOCKSIZE is set, and the -k op- tions are not specified, the block counts will be displayed in units of that size block.
$ df -kP /usr Output, in a strict format suitable for portable scripts, disk space statistics for the /usr file system using kilobyte block sizes.
The df utility exits with one of the following values: 0 Successful completion. >0 An error occurred.
quota(1), fstatfs(2), getfsstat(2), statfs(2), getmntinfo(3), fstab(5), mount(8), quot(8)
The df utility is compliant with the IEEE Std 1003.2-1992 ("POSIX.2") specification.
A df utility appeared in Version 3 AT&T UNIX. MirOS BSD #10-current January 13, 1994 1
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