Logstash 5 not running

ok so my original question is still unanswered. What is the method to run logstash from command line as mentioned in the official document at https://www.elastic.co/guide/en/logstash/current/first-event.html,
if i have installed it from repo?. Also there are no changes in the official document about the issue. People keep talking about breaking change, but think about someone who just landed to the official document and trying to run logstash for the first time.

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