Line (text file)
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Depending on the file system or operating system being used the number of characters on a line may either be predetermined or fixed, or the length may vary from line to line. Fixed-length lines are sometimes called records. With variable-length lines, the end of each line is usually indicated by the presence of one or more special end-of-line characters, such as a line feed or carriage return.
A blank line usually refers to a line containing zero characters (not counting any end-of-line characters); though it may also refer to any line that does not contain any visible characters (consisting only of whitespace).