In Mountain Lion scroll bars are turned off by default, and are only seen if actively scrolling.
How do you enable them, so that they are seen all the time ?
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Alternatively, if you like Terminal commands (for scripting or BetterTouchTool gestures), you can set scroll bars to always be shown with the following command:
defaults write -g AppleShowScrollBars -string Always
To reset this, you can use the following command:
defaults write -g AppleShowScrollBars -string WhenScrolling
You may have to restart the app (or Finder:
killall -HUP Finder) for the change to take effect.
As well as being set globally, these Terminal commands can be used to change the scroll bars specifically per app.
defaults write com.apple.Terminal AppleShowScrollBars -string Always
com.apple.Terminal with the bundle identifier of the app that you want to change.