username> df -k .
Filesystem            kbytes    used   avail capacity  Mounted on
nfsserver.weyr.com:/export/home
		     19510576 13122312 4437208    75%    /home

This shows the actual filesystem name, total kilobytes in the
filesystem, the number of kilobytes currently in use, the number
of kilobytes available, the percent used and the local filesystem
name where the actual filesystem is mounted.  In this example,
the actual filesystem is on nfsserver.weyr.com and is named
/export/home, there are 19,510,576 kb (or 19,510,576 meg) of disk
space on /export/home of which 13,122,312 is used and 4,437,208
is available.  (Note: used + avail is not equal to kbytes.  This
is because the system reserves a portion of disk space for itself.
For this same reason, the capacity may be reported as over 100%.)
The filesystem is 75% full and is mounted on the local filesystem
named /home.

For more information on df, see the manual page (man df).