They're used by ISO 2022 in general. Free version: https://www.ecma-international.org/publications/standards/Ecma-035.htm https://www.ecma-international.org/pub

They're used by ISO 2022 in general. Free version: https://www.ecma-international.org/publications/standards/Ecma-035.htm https://www.ecma-international.org/publications/standards/Ec... Of course Unix didn't interpret them; the terminal did.