nl putting in extra returns on only on some boxes

[Joel Hammer]

I am running this command:
nl -bp___ -s " " -w   3
against some files to number them.
The files look like this:

SITE
___ Foot
___ Leg
SIZE
___ Less than 5 mm
___ More than 5 mm

etc.

The output looks like this on my older linux box:

SITE
1 ___ Foot
2 ___ Leg
SIZE
3 ___ Less than 5 mm
4 ___ More than 5 mm

This is what I want.
However, on my newer, lindows box, nl or somebody is throwing in a line feed
when it doesn't number the line, like so:

SITE
1 ___ Foot
2 ___ Leg

SIZE
3 ___ Less than 5 mm
4 ___ More than 5 mm

The extra line consists of seven blanks and a nl.

The documenation says that if a line is not numbered, the line separator
string is still prepended, but that should be the -s option, which it is
not.

I can eliminate this with a simple sed fix, but, it would be nice to
stop it at the source.

Any insight appreciated,

Joel