[Proj] Getting Extent Using Custom Projection

[Bradley Mclain]

Ok what I have done is made a custom projection and I want to get the new
extent for my data.

The original projection:
"# GDA94 / MGA zone 55
<28355> +proj=utm +zone=55 +south +ellps=GRS80 +towgs84=0,0,0,0,0,0,0
+units=m +no_defs  <>"

The custom projection:
<41002> +proj=merc +lat_ts=0 +lon_0=0 +k=1.0 +x_0=0 +y_0=0 +a= 6378137.0 +b=
6378137.0 +units=m <>

I understand that this must be done by console commands or something but I
have no idea how.

Brad
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