I have recently faced one interview in which I was asked all this questions on various flavors of UNIX.
I have included my answers for which I know about the technology.
Enjoy...

All questions are for command line use in UNIX environments. 

Q: Which command would you use to view partitions and their sizes on Solaris?
A: # df -kh

Q: Which OpenBoot command would you use to print/view OpenBoot environment variables on a SUN server?
A: #printenv

Q: What does ”ypwhich” command do? (Solaris, AIX, Linux)
A: # Will display NIS server to which client is connected to and which NIS Server is master for particular map specified with this command

Q: What is the default port for SSH server? 
A: 22

Q: Which command/commands would you use to manage installed packages on Solaris?
A: #pkginfo #pkgrm # pkgadd #pkgchk

Q: What command would you use to install an OS patch on Solaris?
A: #showrev –p and #patchadd -p

Q: Which Veritas command would you use to display a list of Veritas volumes?
A: # vxprint

Q: Which Veritas command would you use to display a list of disks on a system?
A: # vxdx list

Q: What is the main system configuration utility in AIX?
A: 

Q: Which Veritas Cluster Server command would you use to display the status of a cluster and it’s resources?
A: 

Q: Which command would you use to rename a disk for VMware Guest virtual machine on ESX server 3 storage volume?
A: 

Q: Which command would use on VMware ESX 3 server to display virtual switch configuration?
A:

Q: Which Veritas Cluster Server command would you use to display the status of a cluster and it’s resources?
A: clustat and to manage the cluster configruation use clusvcadm

Q: Which command would you use to rename a disk for VMware Guest virtual machine on ESX server 3 storage volume?
A: the best way is clone vm to different datastore or in the same datastore with different name 
vmkfstools -i \\vmfs\old_vm.vmdk \\vmfs\new_vm.vmdk
this will take care of it all

Q: Which command would use on VMware ESX 3 server to display virtual switch configuration?
A: esxcfg-vswitch -l or user esxcfg-vswitch -help to see all options

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