I downloaded a TIFF image from USGS Earth Explorer from which I determined the contour lines and saved them in a shapefile (see tutorial http://www.qgistutorials.com/en/docs/working_with_terrain.html).

I would like to convert these features to points (just as this ArcGIS tool http://pro.arcgis.com/en/pro-app/tool-reference/data-management/feature-to-point.htm).

Each point should contain xyz information (simple CSV file or similar) which I can import as a surface elevation into FEFLOW (groundwater modelling)

I tried with MMQGIS which gives me the following output:

"shapeid","x","y" "1","-7.4266662066","37.1800028654" "1","-7.42583287327","37.1800083477" "1","-7.42582462244","37.1800000968" "2","-7.42583287327","37.1799959509" "3","-7.4266662066","37.1799959509" "3","-7.42749953994","37.1797223191" "3","-7.42833287327","37.1795834302" "3","-7.4291662066","37.1797917635" "4","-7.42999953994","37.1797223191" "4","-7.43083287327","37.1799959509" "4","-7.43083701921","37.1800000968" "4","-7.4316662066","37.1805556524" "4","-7.43208287327","37.1808334302"

What I want however is:

"x","y","z" "Latitude","Longitude","Elevation"