[uml-user] Can i run uml in the background ?

[ning ji <ni...@ho...>]

Guess the answer is yes,but when i run
 #sudo ./umlinux ubda=./fs6 mem=128M eth0=tuntap,,00:50:F9:00:00:65,10.50.181.51 &
i got this
[1]+  Stopped                 sudo ./umlinux ubda=./fs6 mem=128M eth0=tuntap,,00:50:F9:00:00:65,10.50.181.51

Any hints pls ?Thanks !