The df utility displays the amount of disk space occupied by currently mounted file systems, the amount of used and available space, and how much of the file system's total capacity has been used.
If arguments to df are path names, df produces a report on the file system containing the named file. Thus `df .' shows the amount of space on the file system containing the current directory.
The following options are supported:
Report on all filesystems including the uninteresting ones which have zero total blocks (that is, auto-mounter).
Report the number of used and free inodes. Print ` * ' if no information is available.
Report on filesystems of a given type (for example, nfs or ufs).
When a UFS file system is mounted with logging enabled, file system transactions that free blocks from files might not actually add those freed blocks to the file system's free list until some unspecified time in the future. This behavior improves file system performance but does not conform to the POSIX, Single UNIX Specification, SPARC Conformance Definition, System V Application Binary Interface, System V Interface Definition, and X/Open Portability Guide Standards, which require that freed space be available immediately. To enable standards conformance regarding file deletions or to address the problem of not being able to grow files on a relatively full UFS file system even after files have been deleted, disable UFS logging (see mount_ufs(1M).
A sample of output for df looks like:
example% df Filesystem kbytes used avail capacity Mounted on sparky:/ 7445 4714 1986 70% / sparky:/usr 42277 35291 2758 93% /usr
Note that used+avail is less than the amount of space in the file system (kbytes); 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 (see tunefs(1M)). When all the space on a file system except for this reserve is in use, only the super-user can allocate new files and data blocks to existing files. When a file system is overallocated in this way, df may report that the file system is more than 100% utilized.
list of file systems currently mounted
list of default parameters for each file system
See attributes(5) for descriptions of the following attributes:
|ATTRIBUTE TYPE||ATTRIBUTE VALUE|