fold - fold long lines
fold [-n] [file] ...
-n How long should the output lines be
fold -60 # Fold stdin to 60 characters fold file # Fold file to 80 characters
Fold takes copies its input from the named file (or stdin, if none is specified) to standard output. However, lines longer than the given maximum (default 80) are broken into multiple lines of the maximum length by inserting new line characters.