The .fill command enters line fill mode. Words are processed until there are enough to fill a line without overflowing it. If justification mode is on, Runoff inserts spaces in the line at random to make the right margin line up.
.fill
.f
The .fill command is one of the .standard command settings and the .nofill command is used to terminate the .fill command.
.fill This prints on line one, and so does this.
The output displays as:
This prints on line one, and so does this.