SHELL

applescript open new terminal tab

tell application "Terminal"
    activate
    do script "ping google.com" in front window
    my makeTab()
    do script "ping yahoo.com" in front window
    my makeTab()
    do script "ping msn.com" in front window
end tell

on makeTab()
    tell application "System Events" to keystroke "t" using {command down}
    delay 0.2
end makeTab

open new terminal window with applescript

tell application "Terminal"
	do script "echo Hello World!"
end tell