The .FILL command causes DSR to treat line endings exactly like
    spaces (see also .NO SPACE). Line-filling is the accumulation of
    words on a line until the addition of one more word would exceed
    the right margin. If .NO FILL is in effect, line endings in the
    input file are duplicated in the output file (see also .KEEP).

    Formats

      .FILL

      .NO FILL

    Abreviated formats

      .F

      .NF