NCO:ncap2 is the function to do it: ncap2 -s 'new_var=var1+var2' The output file will have all of the variables that exist in the input file as well as the new_var. Add -O if your input and output files are the same (overwrite). I do not know what the -s stands for. BUT the new_var will have the same long_name as the first variable used for summing (i.e. it could make some things a bit confusing).

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Riinu Ots

if it aint broke, you’re outdated

DevOps&Data Science

Edinburgh, UK