How can you determine the list of open ports in the operating system using Bash commands?

To determine the list of open ports in the operating system using Bash commands, you can use several utilities:

• netstat:

  netstat -tuln
  

  Shows all listening TCP and UDP ports.

• ss (modern replacement for netstat):

  ss -tuln
  

• lsof:

  sudo lsof -i -P -n | grep LISTEN
  

  Shows processes that are listening on ports.

• nmap (if you need to scan the local machine):

  nmap -sT -O localhost
  

These commands will help you get a list of open and listening ports in the system.