platform-tools $pwd
/Users/USER_NAME/Library/Android/sdk/platform-tools
platform-tools $./adb kill-server
* server not running *
platform-tools $./adb start-server
* daemon not running. starting it now at tcp:5037 *
* daemon started successfully *
platform-tools $./adb kill-server
* server not running *
platform-tools $netstat -vanp tcp | grep 5037
tcp4       0      0  127.0.0.1.5037         *.*                    LISTEN      131072 131072   7845      0
platform-tools $lsof -i tcp:5037
COMMAND  PID   USER   FD   TYPE             DEVICE SIZE/OFF NODE NAME
adb     7845 USER_NAME    8u  IPv4 0x20da842c55736aab      0t0  TCP localhost:5037 (LISTEN)
platform-tools $./adb start-server
* daemon not running. starting it now at tcp:5037 *
error: could not install *smartsocket* listener: Address already in use
ADB server didn't ACK
* failed to start daemon *
error: cannot connect to daemon
platform-tools $