You can do this with QGIS.
- Layer->Add Vector Layer-> source type (file) and then browse for the shape file-> ok
- Vector-> Geometry Tools-> Export-Add Geometry Columns-> Select Input Layer vector from dropdown list->Calculate using (Layer CRS)
- Go back to Layer->Open Attribute Table->Select all the rows with Ctrl+A->Click the button named ”Copy Selected Rows to Clipboard”
- Then you can paste it to txt or excel.
- Excel is better you can extract any specific column easily.
Make sure if the points in the shape files is in projection EPSG:4326. In other case, you might get very different lat-long values. You should check the CRS of your file, right-click on the layer > Properties > General Check the CRS there. If your vector file does not have a projection, QGIS sets it to EPSG:4326 as default.
You can verify the correctness of latitude and longitude values obtained above on the map. Please check this web site [http://www.latlong.net/].
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