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 netstat -nap|grep 3000
 # returns list process using port 3000 last column show id of this process
 # tcp        0      0 127.0.0.1:3000          0.0.0.0:*               LISTEN      11249/node          
# tcp        0      0 127.0.0.1:3000          127.0.0.1:35804         ESTABLISHED 11249/node          
# tcp        0      0 127.0.0.1:35804         127.0.0.1:3000          ESTABLISHED 2392/chrome --type= 
# tcp        0      0 127.0.0.1:3000          127.0.0.1:35746         ESTABLISHED 11249/node          
# tcp        0      0 127.0.0.1:35878         127.0.0.1:3000          ESTABLISHED 2392/chrome --type= 
# tcp        0      0 127.0.0.1:3000          127.0.0.1:35878         ESTABLISHED 11249/node          
# tcp        0      0 127.0.0.1:35746         127.0.0.1:3000          ESTABLISHED 2392/chrome --type= 

kill -9 11249
#kills process 11249