[GRASS-user] i.class problems

[Joel]

Hello grass users

I'm a newbie with GRASS.
I'm working with satellite image classification,
and I've faced a problem with the i.class.
I write i.class, put all the inputs need
and then nothing just this message

(Tue Mar 16 13:32:08 2010)                                                      
i.class map=lsat7_123 at landsat group=lsat7_2000 at landsat subgroup=lsat7 outsig=jij
(Tue Mar 16 13:32:08 2010) Command finished (0 sec)

Can anyone tell whats going on here?
Thanks