Q:

Run a command in a new tab in terminal

I'm trying to write a script that could run several commands in several tabs in the terminal.
I found a lot of informations about it, but it doesn't work as I want it to. So I probably need AppleScript. 
• This code run a command in a new window: 
tell app "Terminal"
   do script "echo hello"
end tell

• And this one open a new tab
tell application "Terminal"
  activate
  tell application "System Events"
    keystroke "t" using {command down}
  end tell
end tell

But I didn't figured out how to "mix" them. Any idea ?

A:

tell application "Terminal"
    activate
    tell application "System Events"
        keystroke "t" using {command down}
    end tell
    do script "echo hello" in selected tab of the front window
end tell

