commandlinefu.com is the place to record those command-line gems that you return to again and again.
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Converts a single-track KML (Keyhole Markup Language) file to a GPX file. KML is the geospatial format of choice used by Google Earth, but doesn't interoperate with other GIS applications, websites, or devices ? almost all of which accept GPX.
gps data from geocaching.com is provided for free in .loc format.