Support "unknown command" for subcommands.

[npinto]

Summary of Bug

gaiacli query distr comission --trust-node cosmos1234 returns the error ERROR: unknown flag: --trust-node which is misleading since the typo is from "commission". I believe it should lead to an error stating that comission is "unknown".

Version

cosmos-sdk: 0.34.3
git commit: 1127446f71fa6aeada1bce2718f7f903cc18e548
vendor hash: b0ee613acca9a3a572b558d0481ec7baa008f732431392af81db3555c92c8dd7
build tags: netgo ledger
go version go1.11.5 linux/amd64
cosmos@hgpu:~$ gaiacli version --long
cosmos-sdk: 0.34.3
git commit: 1127446f71fa6aeada1bce2718f7f903cc18e548
vendor hash: b0ee613acca9a3a572b558d0481ec7baa008f732431392af81db3555c92c8dd7
build tags: netgo ledger
go version go1.11.5 linux/amd64

Steps to Reproduce

gaiacli query distr comission --trust-node cosmos1234

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For Admin Use

• Not duplicate issue
• Appropriate labels applied
• Appropriate contributors tagged
• Contributor assigned/self-assigned

[alexanderbez]

Thanks for creating an issue @npinto, but this is how cobra works by default. You can pass whatever you want as a command/argument:

https://github.com/spf13/cobra/blob/f619abc1d7edb30544d1c956719d203ace73e9b1/args.go#L9-L24

Looks like we need to come up with some sort of custom validation. Docker does this but idk how. I don't think this is a huge priority and would love some external contribution for this.