[Geotiff] Is there an easy way to add a graticule and coastline to existing geotiffs?

[pw]

Hello,

I believe this question was asked here before
by someone.

Does one of the OGR or GDAL utilities allow the
overlay of a graticule and coastline vector on
an existing geotiff?

I have found myself with a directory full of
geotiffs that need this. I was hoping to batch
them somehow.

Many thanks if you can help,


Peter