Some common and important commands under Linux

Filter the open message for a port number

NETSTAT-ANPL | grep 9010

Filter information for a service process that is open by a query

Ps-ef | grep node

To force a kill off a process

Killall-9 Service Process Name

KILL-9 Process PID Number

View the number of links open on a port 1) Count 80 port connections

Netstat-nat | Grep-i "80" | Wc-l------------------------primarily viewed with service ports

2) Count httpd protocol connections

Ps-ef | grep httpd | Wc-l-----------------primarily viewed with the service name

3) View the current number of concurrent accesses to Apache:

Netstat-an | grep established | Wc-l

Compare the number of maxclients in httpd.conf

Linux commands:

Netstat-n | awk '/^tcp/{++s[$NF]} END {for (a in S) print A, s[a]} '

Examples of returned results:
Last_ack 5
SYN_RECV 30
Established 1597
Fin_wait1 51
Fin_wait2 504
Time_wait 1057

One of the
SYN_RECV indicates the number of requests waiting to be processed;
Established indicates the normal data transmission status;
Time_wait indicates the number of requests that have finished processing and waiting for the timeout to expire.

Some common and important commands under Linux