The NetCdf Operators


The netCDF Operators, or NCO, are a suite of file operators which facilitate manipulation and analysis of self-describing data stored in the (freely available) netCDF and HDF formats.

Installation Path/sw/dataformats/nco/<version>
4.9.1 (default)April 2019
5.1.7July 2023

  • Man pages are availabe for the binaries (see below).
  • Info pages can be viewed for the keyword nco. Issue from the command line info nco .

  • Manuals in several formats can be loaded from the NCO home page .


The following binaries are delivered: ncap2 ncatted ncbo ncclimo ncdiff ncea ncecat nces ncflint ncks ncpdq ncra ncrcat ncremap ncrename ncwa

Usage of the NCO tools at HLRN

Module-files and environment variables

To activate the package, issue

module load nco

from the command line.

Installation hints


  • build with intel/19.0.3, due to an compiler error full optimisation does not work
  • prerequisites: hdf5, netcdf, antlr, gsl, udunits2
  • passed through most checks, except expected failures. omp-related checks did not work - possibly due to missing omp environment. Since nco is mostly IO-limited, this should not matter. omp-capabilities are not tested yet.
  • install script