network monitor linux, command lsof

http://www.tecmint.com/10-lsof-command-examples-in-linux/

1. List all Open Files with lsof Command

2. List User Specific Opened Files

3. Find Processes running on Specific Port

4. List Only IPv4 & IPv6 Open Files

6. Exclude User with ‘^’ Character

7. Find Out who’s Looking What Files and Commands?

8. List all Network Connections

9. Search by PID

10. Kill all Activity of Particular User