With respect to "pr"

[W. H. Pollock x4575 3S235]

Modifying pr (on sys VR2 anyway) is not reasonable!  This program is so buggy,
convoluted, and bizzare that the only reasonable thing to do is to rewrite it
from scratch!  I tried to fix a bug once, the -w option doesn't work unless
you have more than two columns;  simply removing the test for number of columns
caused pr to stop printing the first line of random pages!  (this fix was
given to me by UNIX support people, and even they gave up on pr!)