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My question is what does it mean to LISTEN or ACCEPT on a port as it relates to my example?

Example: I have a tomcat server, and It will use port 8080. I want to make sure that port is available for me to use.

What commands should I perform on my unix server and why?

what information would a command like this give me: netstat -an | grep LISTEN

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serverfault.com/questions/488486/… –  poige Oct 27 '13 at 16:29
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2 Answers

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You could try sudo lsof -i :8080. That will list the processes doing anything with your port.

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You have not answered any part of my question with this response. –  TazMan Oct 27 '13 at 5:08
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It's better to use :

netstat -ant | egrep :8080

But its parameters:

-a : all
-t TCP protocol
-n numeric, don't use name

please attention to my example for port 80:

tcp        0      1 192.168.1.7:57511       182.50.136.239:80       SYN_SENT   
tcp        0      1 192.168.1.7:57547       182.50.136.239:80       SYN_SENT   
tcp        0      1 192.168.1.7:57512       182.50.136.239:80       SYN_SENT   
tcp        0      1 192.168.1.7:57514       182.50.136.239:80       SYN_SENT   
tcp        0      1 192.168.1.7:57562       182.50.136.239:80       SYN_SENT   
tcp        0      1 192.168.1.7:57565       182.50.136.239:80       SYN_SENT   
tcp        0      1 192.168.1.7:57513       182.50.136.239:80       SYN_SENT   
tcp        0      0 192.168.1.7:39191       198.252.206.25:80       ESTABLISHED
tcp        0      1 192.168.1.7:57563       182.50.136.239:80       SYN_SENT   
tcp        0      1 192.168.1.7:57545       182.50.136.239:80       SYN_SENT   
tcp        0      0 192.168.1.7:39205       198.252.206.25:80       ESTABLISHED
tcp        0      1 192.168.1.7:57546       182.50.136.239:80       SYN_SENT   
tcp        0      1 192.168.1.7:57564       182.50.136.239:80       SYN_SENT   
tcp        0      0 192.168.1.7:49217       198.252.206.16:80       ESTABLISHED
tcp        0      0 192.168.1.7:39247       198.252.206.25:80       ESTABLISHED
tcp      957      0 192.168.1.7:42327       198.252.206.25:80       ESTABLISHED

First column is protocol, second : rec queue (numeric),3th: send queue(numeric) ,4th: local address+ port, 5th: foriegn host:port , 6th: handshaking state such as LISTEN, SYN and so on.

Even you can use :

netstat -antp |egrep tomcat

I example mysql for u :

root@debian:/home/mohsen# netstat -antp |egrep mysql

tcp        0      0 127.0.0.1:3306          0.0.0.0:*               LISTEN      24783/mysqld

A new column has been appended, yes pid/porgram.

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Why using egrep if using none of regular expressions at all? O_o –  poige Oct 27 '13 at 16:28
    
Because almost i use regex, so it was a habi –  Mohsen Pahlevanzadeh Oct 27 '13 at 21:25
    
It's better having a habit to think –  poige Oct 27 '13 at 22:18
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