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In MacOS terminal run:

ps

If you see flutter or dart related process like this:

 PID TTY TIME CMD
 8166 ttys000 0:00.14 -zsh
 8199 ttys000 0:00.00 bash /Users/sabrina/devtools/flutter/bin/flutter zsh-completion
 8212 ttys000 0:00.00 bash /Users/sabrina/devtools/flutter/bin/flutter zsh-completion
 8222 ttys000 0:00.00 bash /Users/sabrina/devtools/flutter/bin/internal/update_dart_sdk.sh

Kill them using kill [id] command, for example:

kill 8222

In 🍏 MacOS terminal run:

ps

If you see flutter or dart related process like this:

 PID TTY TIME CMD
 8166 ttys000 0:00.14 -zsh
 8199 ttys000 0:00.00 bash /Users/sabrina/devtools/flutter/bin/flutter zsh-completion
 8212 ttys000 0:00.00 bash /Users/sabrina/devtools/flutter/bin/flutter zsh-completion
 8222 ttys000 0:00.00 bash /Users/sabrina/devtools/flutter/bin/internal/update_dart_sdk.sh

Kill them using kill [PID] command, for example:

kill 8222