As such there s no difference in the shell. As clarcase is 
a tool that works on the OS shell, you need to set up Path 
for your clearcase tool in the .profile file of your unix 
shell to recognize the cleartool command.
you can see in the /bin folder whether cleartool command is 
there or not.

And if you take windows environment, there is a cleartool 
shell that that is embed with the clearcase tool that you 
wil purchase, this shell will all the clearcase commands.