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MacOS Terminal and iTerm users need to configure their terminal to use the Option key properly. You need Option-Enter to output either Esc+Enter or Meta-Enter.

See https://superuser.com/a/496152 for screenshots.

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I tried, but sometimes I actually need the Alt key to behave like it does by default, to enter modified characters such as ~ (which is not on my keyboard). Any other ways?

ITerm allows you to map the left and right option keys separately. Maybe that helps?

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