df_ufs(1M)

df_ufs -- report free disk space on ufs file systems

Synopsis

df [-F ufs] [generic_options] [-o i] [directory | special]

Description

generic_options are options supported by the generic df command.

df displays the amount of disk space occupied by ufs file systems, the amount of used and available space, and how much of the file system's total capacity has been used.

Note that the amount of space reported as used and available is less than the amount of space in the file system; this is because the system reserves a fraction of the space in the file system to allow its file system allocation routines to work well. The amount reserved is typically about 10%; this may be adjusted using tunefs(1M). When all the space on the file system except for this reserve is in use, only a privileged user can allocate new files and data blocks to existing files. When the file system is overallocated in this way, df may report that the file system is more than 100% utilized.

ufs-specific options

-F ufs

Specifies the ufs-FSType.

NOTE: File system types can be autodetected so in principle this option is no longer required. However, df executes faster if the file system type is specifed rather than having to be autodetected.

-o

Specify ufs file system specific options. The available option is:

i: Report the number of used and free inodes. May not be used with generic_options.

Files

/etc/mnttab: list of file systems currently mounted

References

generic df(1M), du(1M), mnttab(4), generic mount(1M), generic quot(1M), generic tunefs(1M)

Notices

df calculates its results differently for mounted and unmounted file systems. For mounted systems the 10% reserved space mentioned above is included in the number of blocks used. For unmounted systems the 10% reservation is not included in the number of blocks used. The generic -k option displays the free space as a percentage.

The -b and -e options override the -t option.