When you select a section, you will go to a section card . On a section card, you can choose related major topics, related UNIX commands, or command subsets. Several stacks are configured so that when you open them, you go right to a section card, bypassing the top-level card.
Click on any subject title to go the first topic card on that subject. displays a list of topics on that subject.
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Click on the card icon to see a section card. Click again to return here.