Linux checking network services

Check the service listening to port 25

netstat -tunap | grep :25

Fixing MySQL stuck in prerequisites state

Set the following option in configuration file:
optimizer_search_depth=3

Apache HTTP server benchmarking tool

>ab -h

Reading correct MySQL UTF8 text strings

$dbh->do("SET NAMES utf8");

SVG - Scalable Vector Graphics

In HTML5

Editing Linux Firewall rules in shell mode

That could be done by editing /etc/sysconfig/iptables
Then restarting iptables service

To view open services in Firewall run:
iptables -L

Secure remote copy via scp

use scp command for copying remote files via ssh