pnmtile - replicate a portable anymap into a specified size
       pnmtile width height [pnmfile]
       Reads  a  portable  anymap  as  input.   Replicates  it until it is the
       specified size, and produces a portable anymap as output.
       pnm(5)
       Copyright (C) 1989 by Jef Poskanzer.
                                  13 May 1989                       pnmtile(1)