Behavior related to user confirmations for operation varies for different commands

The mentioned differences can be divided into following topics:

1. Confirmation target
   restart and kill commands ask for confirmation once and if confirmed apply the corresponding operation for all instances (when target implies multiple instances, like app-target in case of multi-instances application)
   clean asks confirmation for every single instance implied by target.
2. Discard reply
   restart displays text • Restart is cancelled.
kill produces no output, just finish the execution.
   clean displays • instance: cleaning... [ERR] canceled by user after every discarding.
3. State validation
   clean only asks for confirmation if an instance is not running, otherwise just skips it with displaying instance `some_instance` must be stopped
kill asks for confirmation regardless of instances states.

Consider using the single approach.

Start by comparing the implementations of the restart, kill, and clean commands, focusing on confirmation targets, cancellation output, and state validation. Done means these commands follow one consistent confirmation approach, including behavior for multiple instances and discarded replies.