The comment below tells me the existence of a subcommand `quarto pandoc`, but it doesn't appear in the help (that is, users has no way of knowing the existence of this command).
https://github.com/quarto-dev/quarto-cli/discussions/510#discussioncomment-2494487

```shell
$ quarto --help

  Usage:   quarto 
  Version: 0.9.215
                  

  Description:

    Quarto CLI

  Options:

    -h, --help     - Show this help.                            
    -V, --version  - Show the version number for this program.  

  Commands:

    render          [input] [args...]  - Render input file(s) to various document types.                                                
    serve           [input]            - Serve an interactive document.                                                                 
    create-project  [dir]              - Create a project for rendering multiple documents                                              
    preview         [file] [args...]   - Render and preview a Quarto document or website project. Automatically reloads the browser when
    convert         [input]            - Convert documents to alternate representations.                                                
    capabilities                       - Query for current capabilities (output formats, engines, kernels etc.)                         
    check           [target]           - Check and verify correct functioning of Quarto installation and computation engines.           
    inspect         [path]             - Inspect a Quarto project or input path. Inspecting a project returns its config and engines.   
    tools           [command] [tool]   - Manage the installation, update, and uninstallation of useful tools.                           
    help            [command]          - Show this help or the help of a sub-command.
```

Related to quarto-dev/quarto-cli#598
2022-04-09T06:34:57Z
eitsupi
closed
Subcommands that doesn't exist in the help?
https://github.com/quarto-dev/quarto-cli/issues/596