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Context-sensitive help

As explained in Acing the CCNA Exam: Volume 1 Fundamentals and Protocols

Context-sensitive help is an interactive CLI feature that presents commands, keywords, and completions valid at the current input position.

Context-sensitive help is a Cisco IOS CLI feature that shows commands, keywords, and valid completions for the current input. It helps when a command is forgotten or only partly remembered. section 5.2.4

Discovering a show command

At R1>, show alone is incomplete, so Cisco IOS suggests show ?. Entering show ? displays available keywords such as aaa and arp. After show clock, typing ? reveals detail, the output modifier |, and <cr>, which means Enter can execute show clock without another keyword.

How Acing the CCNA Exam: Volume 1 Fundamentals and Protocols covers it

How deep it goes
Explains four interaction forms with representative output, stopping short of implementation internals.
Examples
Uses R1 prompts, show ?, show clock ?, abbreviations, Tab completion, ambiguous input, and a feature comparison table.
What it assumes
Assumes access to a Cisco IOS prompt while teaching command syntax, CLI modes, keywords, abbreviations, and completion from examples.
What you can do after
Apply it via the Cisco IOS CLI to discover valid commands, inspect keywords, complete input, and avoid ambiguous abbreviations.
How it connects
Connects command completion with Cisco IOS CLI, EXEC mode, configuration mode, show commands, and output modifiers.
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Related concepts

This explainer was generated by Manning's knowledge graph from the text of Acing the CCNA Exam: Volume 1 Fundamentals and Protocols. The section links point to the parts of the book it draws on.