try that command and you will see

mine from $HISTSIZE=1000 would be:
103 ls
99 cd
88 vi
42 rm
40 more
28 pwd
22 tar
22 awk
15 sed
13 man

regards pressy

You can tell this box had some disk issues

62 ls
42 cd
34 metastat
32 ptree
26 /usr/platform/`uname -i`/sbin/prtdiag
20 rm
20 cfgadm
19 format
15 ps
14 tail

My two cents..
1. iostat (have seen slow response too many times due to overloaded disks)
2, 3. netstat, ifconfig (know thy ip addresses and ports)
4, 5. lsof, ps (keep an eye on which process is doing what)
6. awk (to make sense of the ps and lsof)
7. grep (when awk is too powerful)
8. truss (if you have any good ol' C,C++,pro*C programs that go awry)
9. kill (-3 to get thread dumps - super useful if you have application servers on your box and sometimes you have no choice but a good '-9')
10. vxdiskadm (hate this command, never use it, but can't think of any other command that lets you do Veritas volume manager admin through a single command).

Here's my Solaris top 10 usefull commands

egrep
prstat
ls -Alh (h flag is Sol10 only)
vim (Sunfreeware)
ps -ef
chmod
chown
showmount
prtdiag
dmesg

I am no SysAdmin.

My top 10 commands... order does not matter.

ps
make
vim
find
grep
cd
ls
diff
ctags
gdb

10 commands you need.

1. cp - use it before you edit a file like /etc/system
2. tar cf - use it before you edit a file/configuration/move a server
3. ufsdump - use it before you change a filesystem/file/configuration/disk/move a server
4. pwd - use it before you do that rm -r ./*
5. uname -a - use it before you do that rm -r ./* (make sure you are on that host you "know" you are on)
6. ufsrestore - won't be any good if you can't bring those ufsdumps back
7. tar xf - won't be any good if you can't bring those tar'ed files back
8. man - you can find so many more commands that will cause you to need these others to get you out of trouble
9. vi - and more importantly, :q! to get out without saving.
10. exit, logout - keeps a server safe!