There is a "missing linefeed indicator" symbol (usually %) that is output if there is no trailing newline. So the output of the program that outputs a newline

There is a "missing linefeed indicator" symbol (usually %) that is output if there is no trailing newline. So the output of the program that outputs a newline looks like: $ program output $ And output of the program without trailing newline: $ program output% $ There is an issue if the program is expected to output "%" at the end, of course.