Bash - rename your file name

for i in *.rmvb; do mv $i `echo $i | cut -d '.' -f 2,3,4,5,6`; done

ex: 远古外星人.Ancient.Aliens.S02E10.HDTV-RMVB.rmvb to Ancient.Aliens.S02E10.HDTV-RMVB.rmvb