How to permamently change terminal font size via commandline/terminal?
osascript -e "tell application \"Terminal\" to set normal text color of window 1 to ${color}"
osascript -e "tell application \"Terminal\" to set background color of window 1 to ${color}"
osascript -e "tell application \"Terminal\" to set the font name of window 1 to \"$1\""
osascript -e "tell application \"Terminal\" to set the font size of window 1 to $2"



http://www.ict4g.net/adolfo/notes/2014/07/16/change-osx-terminal-settings-from-command-line.html