Linux Networking Cheat Sheet/Listen on a TCP port

Open a simple TCP listener for testing.

Section: Sockets and Connections

Listen on a TCP port

bash
bash
nc -lv 9000
Explanation

Open a simple TCP listener for testing.

Learn the surrounding workflow

Compare similar commands or jump into common fixes when this command is part of a bigger troubleshooting path.

Related commands

Same sheet · prioritizing Sockets and Connections
Test TCP connectivity
Check whether a remote TCP port is reachable.
OpenIn sheetbashsame section
Forward a local port
Create a TCP port forward with socat.
OpenIn sheetbashsame section
Show listening TCP sockets
List listening TCP sockets with names.
OpenIn sheetbashsame section
Show listening UDP sockets
List listening UDP sockets with names.
OpenIn sheetbashsame section
Show established connections
Display established TCP sessions.
OpenIn sheetbashsame section
Filter sockets by port
Find sockets using a specific local port.
OpenIn sheetbashsame section