Difference between Apache processes & connections ( netstat )

kumartnj · 04-07-2014, 07:25 AM

Hi All,

Need someone help here

I need to know the difference between the below 2 commands and the output

[xxx@yyy ~]$ netstat -an | grep 8009 | wc -l
93

[xxx@yyy ~]$ ps -ef | grep apache | wc -l
39

Thanks in advance !

Regards
Kumar

unSpawn · 04-07-2014, 05:41 PM

Code:

[xxx@yyy ~]$ netstat -an

As unprivileged user list all network connections and disable name resolution (that's good)

Code:

| grep 8009

grep the output for the arbitrary string "8009" (no explanation so here that could be a port or inode number or part of a name of a socket)

Code:

 | wc -l

count the output lines

Code:

[xxx@yyy ~]$ ps -ef

As unprivileged user full-format list all processes (a lot of people haven't heard of 'pgrep' or the "-C" arg of 'ps')

Code:

 | grep apache

grep the output for the arbitrary string "apache" (that could be any part of a user or process or file name or argument)

Code:

 | wc -l

count the output lines

If you want to count all TCP/8009 ports that aren't in use (listening) or closing down (any *_WAIT states) you could use 'lsof -Pwln -iTCP:8009 -sTCP:ESTABLISHED|wc -l'.
Counting process names "/usr/sbin/httpd" could be 'pgrep httpd|wc -l' or in BASH: 'PIDS=($(\ps --no-header -C httpd -o pid)); echo ${#PIDS[@]};'.