Here's how you can use bold fonts, ANSI colors and bright colors in the terminal application in OS X.
1. Open the terminal app.
2. Go to Preferences.
3. Go to Settings.
4. Double click your preferred profile in the left side menu.
5. A new terminal window will open with your changes.
For more, see the original article at the link below.
Enable Bold Fonts, ANSI Colors, & Bright Colors | OS X Daily