View the total number of linux network connections

View the number of connections in various states of the system tcp connection. Netstat-an | awk & amp; #39;/^ tcp/{++ S [$ NF]} END {for (ainS) printa, S [a]} & amp; #39; view all ipnetstat-an connections established with Port 80 of the local machine and in the status of established | grep... view the number of connections in various states of the system tcp connection.

Netstat-an | awk '/^ tcp/{++ S [$ NF]} END {for (a in S) print a, S [a]}'
View all ip addresses that are connected to port 80 of the local machine and are in the status of established


Netstat-an | grep 80 | grep ESTA | awk '{print $5 "\ n"}' | awk 'BEGIN {FS = ": "} {print $1" \ n "} '| sort | uniq
The number of connections of each ip address and the total number of connections in each status are output.


Netstat-n | awk '/^ tcp/{n = split ($ (NF-1), array, ":"); if (n <= 2) ++ S [array [(1)]; else ++ S [array [(4)]; ++ s [$ NF]; ++ N} END {for (a in S) {printf ("%-20 s % s \ n", a, S [a]); + + I} printf ("%-20 s % s \ n", "TOTAL_IP", I); for (a in s) printf ("%-20 s % s \ n", a, s [a]); printf ("%-20 s % s \ n", "TOTAL_LINK ", N );}'