Wrap lines of text to a specified width (the default is 80 characters).
fold [options] [files]
-b counts bytes instead of columns, so backspaces and tabs are counted.
-s breaks lines at word boundaries.
-w N (where N is a number) sets line width to N characters.
The fold command wraps each input line to a specified number of characters and displays the results on the screen (standard output). If you do not specify any filename, fold reads lines from the standard input.