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NCO (netCDF Operators) is a suite of standalone command-line programs for inspecting, transforming, and analysing scientific data stored in netCDF-accessible formats. You can use individual operators to select data, calculate averages and statistics, combine or derive data, and edit metadata, either interactively in a shell or in repeatable scripts.
What NCO does
NCO is a set of focused shell-level tools, not a graphical data-analysis application. Each operator accepts input file or files, performs a particular operation, and can write a processed output file. The official guide describes examples including averaging, hyperslabbing (selecting a portion of an array), and renaming.
That makes NCO useful when you need to handle scientific array data without leaving a netCDF-oriented command-line workflow. Climate researchers and geoscientists use it, but the project’s guide describes the tools as general-purpose for netCDF data.
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Start with the change you need to make, then consult the current guide for that operator’s syntax, options, and caveats.
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| Task | Operator | What it does |
|---|---|---|
| Select or inspect data, including a subset of variables or dimensions | ncks |
Performs selection and related operations on netCDF data. |
| Calculate record averages | ncra |
Computes averages across records. |
| Calculate weighted averages | ncwa |
Computes weighted averages. |
| Rename a variable or dimension | ncrename |
Renames netCDF variables or dimensions. |
Other NCO uses include deriving fields, calculating statistics, printing data, comparing or combining files, and changing metadata. Exact behavior depends on the operator and its options; use the manual entry for the command you plan to run rather than assuming that all operators handle files identically.
How to approach a command-line workflow
- Identify the desired result. Specify which variables and dimensions you need, whether you need an aggregation such as an average, and what output you want to preserve.
- Check your environment. The guide’s build and use discussion requires netCDF. Check the installed NCO and netCDF versions and the features of the libraries linked to your NCO build.
- Pick the operator for the operation. For example, use
ncksfor selection,ncrafor record averaging,ncwafor weighted averaging, orncrenamefor renaming. - Confirm the command details. Read the current operator documentation for its exact options, input and output expectations, and format-specific limits.
- Run it on the intended input and check the output. Confirm that the resulting variables, dimensions, metadata, and file format fit the next step in your workflow.
This task-first approach also applies to questions such as converting hourly measurements to daily mean temperature: define the time records and the desired aggregation, then check the relevant NCO operator documentation for the required syntax and assumptions.
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Which file formats NCO can handle
The project describes NCO as working with netCDF-accessible formats, including DAP, HDF4, HDF5, and Zarr. That broad description is not a guarantee that every NCO build or operator supports every format in the same way.
The guide says a netCDF4-enabled NCO handles netCDF3 and netCDF4/HDF5 data. HDF4 support depends on linking against a netCDF library built with HDF4 support. Input and output formats can also depend on the input file and the operator, and the guide notes exceptions to format-conversion behavior.
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- Check the NCO and netCDF versions installed in your environment.
- Check which features were enabled in the linked libraries.
- Consult the documentation for the specific operator and file type in your workflow.
A filename extension alone does not establish compatibility.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Current documentation and where to check details
The official NCO User Guide documents version 5.4.1 and was last updated on 2 October 2026. This is the guide’s version and update date; it does not establish that a particular installation is running that release. Compare the documentation with your installed version before relying on version-specific instructions.
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For operator syntax and caveats, use the NCO User Guide. The NCO project homepage describes the suite and its uses, while the NCO repository provides project source-code context.
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