To view disk free status:
# df (disk free): It displays disk free in terms of blocks.
# df -k : It displays disk free status in kilobytes.
# df -h : It displays disk free status in human readable form.
# df -h : It display disk free status of specific slice.

To view disk usage status:
# du (Disk usage): It displays disk usage in blocks
# du /etc : Example of usage for the command.
# du -h : To view the same information in human readable form.

To view the quote of file system: This command displays the file system ownership.

# quot /export/home : to summarize a particular file system.
# quot -a : it summarize all file systems.
Example for quot command is:

root@testmy # quot -a
/dev/rdsk/c1t0d0s0 (/):
6540613 root
5041 adm
854 uucp
396 #192418
162 appls
111 infra
54 noaccess
30 check
14 lp
11 bin
6 daemon
4 nobody
4 smmsp
2 gdm
2 webservd