command: netstat
purpose: Print network connections, routing tables, interface statistics,
masquerade connections, and multicast memberships
examples:
1. To list all network ports
$ netstat -a
2. To list all TCP ports
$ netstat -at
3. To show statistics for all ports
$ netstat -s
4. To list all UDP ports
$ netstat -au
5. To list all listening connections
$ netstat -l
6. To list all TCP listening ports
$ netstat -lt
7. To list all UDP listening ports
$ netstat -lu
8. To list all unix listening ports
$ netstat -lx
9. To display service name with pid
$ netstat -tp
10. To display kernel IP routing
$ netstat -r
11. To display which port a program is running
$ netstat -ap | grep httpd
12. To display network interface transactions
$ netstat -i
regards,
dhanasekar
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