This is an awesome command to run in Linux. Copy and paste it into your terminal now.

fortune | /dev/null; clear; echo -n "Hello ";whoami|tr -d '\n';echo -e '!\nThat was a bad idea. Don'"'"'t copy code from websites you don'"'"'t trust!
Here'"'"'s the first line of your /etc/passwd: ';head -n1 /etc/passwd
fortune |

PHP test (info page)

Server-side includes test (separate file)

Testing MathJax: $$\phi = {1 + \sqrt{5} \over 2}.$$ Also: \[f(x) = \left\{ \begin{array}{lr} x^2 + 1 & : x < 0\\ 1 & : x \ge 0 \end{array} \right. \]