NCO(1)

NAME
NCO - netCDF Operators

SYNTAX
operator [ options] input-files output-file

DESCRIPTION

The netCDF Operators, or NCO are a suite of programs known as operators. Each operator is a standalone, command line program which is executed at the UNIX shell-level like, e.g., ls or mkdir. The operators take netCDF (<http://www.unidata.ucar.edu/packages/netcdf>) files as input, then perform a set of operations (e.g., deriving new data, averaging, hyperslabbing, or metadata manipulation) and produce a netCDF file as output. The operators are primarily designed to aid manipulation and analysis of gridded scientific data. The single command style of NCO allows users to manipulate and analyze files interactively and with simple scripts, avoiding the overhead (and some of the power) of a higher level programming environment. The NCO Users Guide illustrates their use with examples from the field of climate modeling and analysis.

The available operators are:

    ncap2, netCDF Arithmetic Processor
    ncatted, netCDF Attribute Editor
    ncbo, netCDF Binary Operator (includes ncadd, ncsubtract, ncmultiply, ncdivide)
    nces, netCDF Ensemble Averager
    ncecat, netCDF Ensemble Concatenator
    ncflint, netCDF File Interpolator
    ncks, netCDF Kitchen Sink
    ncpdq, netCDF Permute Dimensions Quickly, Pack Data Quietly
    ncra, netCDF Record Averager
    ncrcat, netCDF Record Concatenator
    ncrename, netCDF Renamer
    ncwa, netCDF Weighted Averager.
(Note that the "averagers" are misnamed because they perform many non-linear operations as well, e.g., total, minimum, maximum, RMS).

The operators are as general as netCDF itself: there are no restrictions on the contents of the netCDF file(s) used as input. NCO's internal routines are completely dynamic and impose no limit on the number or sizes of dimensions, variables, and files. NCO is designed to be used both interactively and with large batch jobs. The default operator behavior is often sufficient for everyday needs, and there are numerous command line (i.e., run-time) options, for special cases. NCO works well on all modern operating systems.

AUTHOR
NCO manual pages written by Charlie Zender and originally formatted by Brian Mays.

REPORTING BUGS
Report bugs to <http://sf.net/bugs/?group_id=3331>.

COPYRIGHT
Copyright © 1995-present Charlie Zender
This is free software; see the source for copying conditions. There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

SEE ALSO
The full documentation for NCO is maintained as a Texinfo manual called the NCO Users Guide. Because NCO is mathematical in nature, the documentation includes TeX-intensive portions not viewable on character-based displays. Hence the only complete and authoritative versions of the NCO Users Guide are the PDF (recommended), DVI, and Postscript versions at <http://nco.sf.net/nco.pdf>, <http://nco.sf.net/nco.dvi>, and <http://nco.sf.net/nco.ps>, respectively. HTML and XML versions are available at <http://nco.sf.net/nco.html> and <http://nco.sf.net/nco.xml>, respectively. If the info and NCO programs are properly installed at your site, the command

    info nco

should give you access to the complete manual, except for the TeX-intensive portions. ncap2(1), ncatted(1), ncbo(1), ncclimo(1), nces(1), ncecat(1), ncflint(1), ncks(1), nco(1), ncpdq(1), ncra(1), ncrcat(1), ncremap(1), ncrename(1), ncwa(1)

HOMEPAGE
The NCO homepage at <http://nco.sf.net> contains more information.