CDO

Could you please send a link to your data?

if you have access to ECMWF/ECS machine, the file is located at /ec/res4/scratch/scha/scratchdir/test/lfpw_System9-v20250101_forecast_S2025060100_atmos_12hr_pressure_zg_r19i00p00.nc
with read permissions.
Otherwise, tell me where to place this 0.7GB file

Unfortunately, I do not have access to the machine. Maybe you can select the first 3 time steps with the NCO tool ncks:

ncks -d time,0,2 infile.nc outfile.nc

Here is the file after selecting some dates from the initial file with cdo seltimestep (ncks doesn't work)

Thank you, but I need data that has not been selected/changed by CDO and this is only possible with NCO.

Here is the file extracted by the command "ncks -d leadtime,0,2 infile.nc outfile.nc"

Thanks for the data! This is a specific problem in CDO release 2.5.1 and has been fixed in 2.5.2. It still works fine in version 2.5.0.