how to free up port in linux code example

Example 1: free port in linux

netstat -tulnap        // list all ports and processes
netstat -anp|grep "port_number"     // show port details
sudo fuser -k Port_Number/tcp       // free the port needed
# or
lsof -n -i :'port-number' | grep LISTEN  // get port details
# sample  response:  java   4744 (PID)  test  364u  IP0 asdasdasda   0t0  TCP *:port-number (LISTEN)
kill -9 PID  // free port

Example 2: force to kill any process port ubuntu

sudo kill -9 $(sudo lsof -t -i:9001)


lsof   - list of files(Also used for to list related processes)

-t     - show only process ID

-i     - show only internet connections related process

:9001  - show only processes in this port number

kill   - command to kill the process

-9     - forcefully

sudo   - command to ask admin privilege(user id and password).