Set the size of the current terminal to number of columns and rows.

terminal-size.sh

#!/usr/bin/env bash

if [ $# != 0 -a $# != 2 ]; then
    echo `basename $0`" <cols> <rows>"
    exit
fi

COLS=${1:-80}
ROWS=${2:-25}

osascript << EOF
tell application "Terminal"
	tell first window
		tell first tab
			set number of columns to ${COLS}
			set number of rows to ${ROWS}
		end tell
	end tell
end tell
EOF