df - (BSD) disk free
] [-M mtab
Df prints file system statistics. A file system is selected by a file it
contains, or by its device file, as specified by the file
argument is given, statistics are printed for all mounted file
command accepts the following options:
- Print statistics for all mounted file systems. Normally, file systems with
zero block count are omitted.
- Print i-node statistics.
- -t fstype
- Restrict output to filesystems of type fstype.
The following options have been introduced by POSIX.2:
- Select the portable (POSIX) output format. Changes the
default size unit to a block consisting of 512 bytes.
- If combined with the -P option, the size unit is changed from blocks to
The following options are extensions:
- Prints the sizes in human-readable powers of 1024, i.e. `K' for kilobyte,
`M' for megabyte, `G' for gigabyte, `T' for terabyte, `P' for petabyte,
and `E' for exabyte.
- -M mtab
- Use the specified mtab file to get a list of mounted
- default mount table
find(1), statvfs(2), mtab(5), mount(8)
implementation cannot handle unmounted file systems.
Some advanced file system designs allocate i-nodes dynamically. Df
tries to estimate free and total counts of available files. This is currently
done for the reiserfs