$ echo -e "\e[33mhoge\e[m"
echo -eでバックスラッシュの使用を許可する。
なお、-eにはおまじない的な使い方があるそうな。
Esc[Value;...;Valuem Set Graphics Mode: Calls the graphics functions specified by the following values. These specified functions remain active until the next occurrence of this escape sequence. Graphics mode changes the colors and attributes of text (such as bold and underline) displayed on the screen.
