``` lsof -stcp:listen -itcp:80 -tnP ``` ## ChatGPT Explanation Sure, the `lsof` command is used in Unix-based systems to list open files and the processes that opened them. It stands for “list open files”. Here’s a breakdown of the command you asked about: - `-s` is used to specify the file state for network files. It’s combined with `tcp:listen` to filter the list for files that are in the listening state. - `-i` is used to select the listing of files any of whose Internet address matches the address specified in `tcp:80`. This is commonly used for network connections. - `-t` instructs `lsof` to produce terse output with process identifiers only - no header, user, FD, or device. - `-n` inhibits the conversion of network numbers to hostnames for network files. - `-P` inhibits the conversion of port numbers to names for network files. So, this command will list the process IDs (`-t`) of all processes that are listening (`-s`) on TCP port 80 (`-i`) and it will display raw IP addresses (`-n`) and port numbers (`-P`) instead of trying to resolve them to names.