-b     Count width in bytes rather than column positions.

-s     If a segment of a line contains a <blank> within the first  width  column  positions  (or  bytes),
       break  the  line after the last such <blank> meeting the width constraints. If there is no <blank>
       meeting the requirements, the -s option shall have no effect for that output segment of the  input
       line.

-w  width
       Specify  the  maximum  line length, in column positions (or bytes if -b is specified). The results
       are unspecified if width is not a positive decimal number. The default value shall be 80.