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lang-bash
sed -z 's/.$//will do what you're looking for, working with multiple lines too.sed: illegal option -- zonmacOS\nis a character, @LuisA.Florit :) You can amend the regex easily if you know more about your input, for example/.\n$/\n/in your case to keep the last newline and remove the character before the last newline. I think even/.\n?$/\n/might be an option to ensure a new line at the end of stream.