I don't know what your expectations are but the command you provide will run memcached, which will start silently. You can check that memcached is running by using ps
ps -ef | grep memcached | grep -v grep
496 25480 1 0 07:20 ? 00:00:00 memcached -d -p 11211 -u memcached -l 192.168.254.188
or you can use netstat to see if it's listening
netstat -tnlp | grep 11211
tcp 0 0 0.0.0.0:11211 0.0.0.0:* LISTEN 25791/memcached
tcp 0 0 :::11211 :::* LISTEN 25791/memcached
I've only ever installed memcached using my Linux distros package manager and in doing so get access to the distro's service control e.g.
service memcached start
Starting memcached: [ OK ]
service memcached status
memcached (pid 26330) is running...
service memcached stop
Stopping memcached: [ OK ]
or their /etc/init.d/memcached equivalents.