What steps did you take:
Ran imgpkg

What happened:
I got an error:

imgpkg: Error: Use one of available subcommands: completion [bash|zsh|fish|powershell], copy, describe, help [command], pull, push, tag, version

What did you expect:
To see the help text like in imgpkg --help

Anything else you would like to add:
This seems like a standard CLI behavior, sed, grep, kubectl, most CLIs that don't have a useful argument-less behavior just print help

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