How to extract every nth time steps

I can not find a way to use seltimestep in order to extract every nth timestep of a netcdf file. For example, if I have the following time steps

0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16, ...

I would like to extract every 2 timesteps starting from 1st timestep

0,2,4,6,8,10,12,14,16, ...

The command that I was playing around with is

cdo seltimestep,1/2/1000 (assuming I have total 1000 timesteps)

and it does not work as I intended. How do I do this?

Nevermind, I found out how to do it. Look at this post (https://code.mpimet.mpg.de/boards/1/topics/4586) as a reference, I found out the solution for my question.

cdo seltimestep,1/1000/2 infile.nc outfile.nc

So, in general case

cdo seltimestep,first_timestep/end_timestep/nth_time_step infile.nc outfile.nc

Good that you already found the solution!

You can also use the select operator with timestep:

cdo -select,timestep=1/1000/2 infile.nc outfile.nc

(1-2/2)

CDO