Hi list!

I'm a newbie in geoprocessing and I need to transform a WKT representation to a proj.4. I found a example using proj utility:

+proj=merc +a=6378137 +b=6378137 +lat_ts=0.0 +lon_0=0.0 +x_0=0.0 +y_0=0 +k=1.0 
+units=m +nadgri...@null +wktext +no_defs

but I don't understand nothing about! Someone could tell me some resource or 
help me for translate the following WKT to proj.4?

GEOGCS[
        "GCS_South_American_1969",
        DATUM[
                "D_South_American_1969",
                SPHEROID[
                        "GRS_1967_Truncated",
                        6378160.0,
                        298.25
                ]],
                PRIMEM[
                        "Greenwich",
                        0.0
                ],
                UNIT[
                        "Degree",
                        0.0174532925199433
                ]
]

Thanks for tips!!
José
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