TLDR
Enter a command. For example: pm2, ocrmypdf, wc, pdfseparate.

netstat

 
Displays network-related information such as open connections, open socket ports, etc. More information: https://man7.org/linux/man-pages/man8/netstat.8.html.
 
  • List all ports:
     
    netstat --all
     
  • List all listening ports:
     
    netstat --listening
     
  • List listening TCP ports:
     
    netstat --tcp
     
  • Display PID and program names:
     
    netstat --program
     
  • List information continuously:
     
    netstat --continuous
     
  • List routes and do not resolve IP addresses to hostnames:
     
    netstat --route --numeric
     
  • List listening TCP and UDP ports (+ user and process if you're root):
     
    netstat --listening --program --numeric --tcp --udp --extend

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