CDO is a collection of command line Operators to manipulate and analyse Climate and NWP model Data. Supported data formats are GRIB 1/2, netCDF 3/4, SERVICE, EXTRA and IEG. There are more than 600 operators available.
On Ubuntu 18.04 and newer, this is on the standard PATH - just type 'cdo'
On older versions load the module:
$ module add cdo $ cdo -h
Online at https://code.zmaw.de/projects/cdo/wiki/Cdo. Or get information about a particular operator by typing cdo -h operator.
Requires HDF5 and NetCDF. It is possible to build a version with szip which we have done; this version can't be distributed further because of licence issues.
On Ubuntu 18.04 decided to go with the system version.