[Cloud9] Address already in use [Solution]

Appearance of [Address already in use]

Web server: Puma library: Sinatra is in use on cloud9.

When I changed the contents of the rb file and tried to restart the server in the terminal,

$ ruby　 ○○.rb -o $IP -p $PORT Against

〜〜〜〜〜〜〜〜〜　　　Address already in use Was returned. When I looked it up, I got an error that I couldn't open it because Sinatra was already running in another terminal.

However, another terminal is not open in the first place, what should I do?

[Solution] Immediately before, it seemed that the cause was that I closed the tab without closing the terminal while using cloud9. So

$ killall ruby When I finished everything with the kill command and started it again, it was solved successfully.

If you don't understand it, it's a kill command!

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