tldr/pages/linux/help.md

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# help
> Display information about Bash builtin commands.
> More information: <https://www.gnu.org/software/bash/manual/bash.html#index-help>.
- Display the full list of builtin commands:
`help`
- Print instructions on how to use the `while` loop construct:
`help while`
- Print instructions on how to use the `for` loop construct:
`help for`
- Print instructions on how to use `[[ ]]` for conditional commands:
`help [[ ]]`
- Print instruction on how to use `(( ))` to evaluate arithmetic expressions:
`help \( \)`
- Print instructions on how to use the `cd` command:
`help cd`