Snow font size change?
 

How do you change the standard font size in OSX. My friends got the 27" iMac and they think the font is too small. They don't want any applications installed (tinkertool does this.)

Any terminal commands?

Try this link: http://lmgtfy.com/?q=osx+change+default+font+size&l=1

1st hit should be the answer to your question.