Set CentOS clock to use UTC

rm -f /etc/localtime
ln -s /usr/share/zoneinfo/UTC /etc/localtime

bind() to 0.0.0.0:80 failed (98: Address already in use)

sudo fuser -k 80/tcp

Use ntp on CentOS

ntp - network time protocol

yum install ntp
chkconfig ntpd on
ntpdate pool.ntp.org
service ntpd start

Create Git Repository

You can easily create a git repository by running the below command

git init --bare --share /path/to/my.repository.git

You can clone that Git repository using the follwing command

git clone --local /path/to/my.repository.git

SyntaxHighlighter

Use the below to enclose the code that needs to be highlighted.

<pre class="brush: bash">
</pre>

bash can be replaced with css, xml, jscript, php, python, ruby

I'm assuming that you are using SyntaxHighlighter, and also have installed the associated shBrushXXX.js file

Using vi with cron

Override default editor used by crontab or root

VISUAL=vi crontab -e

Giving Power the Corect Way

The correct way to appoint sudoers is by putting the definition in /etc/sudoers.d/filename-init

The content would look something like this.

newusername ALL=(ALL) NOPASSWD:ALL