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The question mark. It can be used in different contexts, for example:

?

(list all commands that make sense in the current context)

s?

(list all commands that start with s)

show ?

(list what options you have as the second word after the SHOW command, for example, show ip, show running-config, etc.)

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13y ago
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13y ago

? is the help command in Cisco IOS

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Q: What is the help command in the cisco ios?
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