Library /sys$common/syshlp/edthelp.hlb CHANGE, SUBCOMMANDS, FILL  *Conan The Librarian (sorry for the slow response - running on an old VAX)

 The FILL command reformats a block of text so that as many complete
 words as possible are placed on each line without exceeding the right
 margin.  It sets the right margin to the terminal width minus 1
 character by default.  The margin can be changed by the SET WRAP
 command.

 Format: [+|-][count]FILL[+|-][count][+|-]entity