is possible to launch command line(shell) from HMC console?
Yes as long as you have setup the SSH access in the HMC management area in the GUI. All you do is SSH to the HMC using hscroot as your user and the same password you would use from the GUI login, simple!
well, if you log into HMC console as hscroot, there is no need to config ssh, just go to HMC management, Open Restricted Shell Terminal