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Mac OS X: find the program running on a port « databasically // Kansas City Small Business IT && Ruby on Rails Programming

 

Sometimes, there’s a program running on a port and you don’t know what it is. How do you find out? I find this happens when I start a webserver up to test something locally and then I forget about it. So, if I wanted to find out what was running on port 80:

  sudo lsof -i :80 # checks port 80
  COMMAND   PID USER   FD   TYPE    DEVICE SIZE/OFF NODE NAME
  ruby    64888   wg    6u  IPv4 0x6ddd270      0t0  TCP *:gds_db (LISTEN)

 
This command shows a list of open files. The -i option checks for internet addresses with the colon symbol representing a port (instead of an actual IP address).