I've read that mapping Left Option key to Esc+ should fix many of the issues users of Bash, on MacOS, have with GNU Readline key-bindings.

However, I've never encountered Esc+ or +Esc before, so does it mean Esc, Meta, Ctrl, or something else? How can I test what key my Left Option is mapped to after enabled Esc+ or +Esc?


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