fold(1)
NAME
fold − fold long lines for finite width output device
SYNTAX
fold [−width] [file...]
DESCRIPTION
The fold command is a filter which will fold the contents of the specified files, or the standard input if no files are specified, breaking the lines to have maximum width width. The default for width is 80. The width should be a multiple of 8 if tabs are present, or the tabs should be expanded using expand() before coming to fold.
RESTRICTIONS
If underlining is present it may be messed up by folding.