CDO

I have a file tmp1.nc that has a single variable with a 3-hourly timestep.

I would like to calculate the daily mean and daily maximum of the variable in this file and merge the results into a single file, all in one processing step. Based on examples I found on this forum, I tried:

cdo merge -chname,iceflux,iceflux_mean -daymean tmp1.nc -chname,iceflux_max -daymax tmp1.nc tmp2.nc

but this fails with:

cdo(3) chname (Abort): Odd number of input arguments!

logical seemed to me to try this:

cdo merge [-chname,iceflux,iceflux_mean -daymean tmp1.nc] [-chname,iceflux_max -daymax tmp1.nc] tmp2.nc

but that fails with

cdo(1) daymean: Open failed on >tmp1.nc]<
                No such file or directory

Thanks for your help to find the correct way to do this!

Jed