command line – How to change terminal title?

One option:

gnome-terminal --title="my_title"

For this to work, you probably have to comment this fragment in ~/.bashrc

case "$TERM" in
xterm*|rxvt*)
    # Comment this
    #PS1="(e)0;${debian_chroot:+($debian_chroot)}u@h: wa)$PS1"
    ;;
*)
    ;;
esac

You may also try issuing command

echo -ne "33)0;my_title07"

See also this.