I have a requirement to convert .KML file to GeoJSON or JSON. Can you please recommend open source command line tools on GNU/Linux(2.6.32-358.14.1.el6.x86_64)? I have installed gdal, I am getting below error.

    ogr2ogr -f "GeoJSON" geojson.json Areas.kml

> Unable to open datasource `Areas.kml' with the following drivers.   ->
> ESRI Shapefile   -> MapInfo File   -> UK .NTF   -> SDTS   -> TIGER  -> S57   -> DGN   -> VRT   -> REC   -> Memory   -> BNA   -> CSV   -> GML   -> GPX   -> KML   -> GeoJSON   -> GMT   -> AVCBin