CDO

Start a cygwin terminal. You need to untar the tar file:

$ tar -xf eccodes-2.9.0-Source.tar

$ tar -xzf eccodes-2.9.0-Source.tar.gz

ECCODES_DEFINITION_PATH=/home/your_cygwin_username/eccodes-2.9.0-Source/definitions

ECCODES_DEFINITION_PATH=~/eccodes-2.9.0-Source/definitions

echo 'export ECCODES_DEFINITION_PATH=~/eccodes-2.9.0-Source/definitions' >> .bashrc

I recommend that you google up and read a tutorial on using the bash shell. And if you are a first time cygwin user beware of editing text files in your cygwin file system with a windows based text editor (https://cygwin.com/faq/faq.html#faq.api.cr-lf). If you do, make sure the text editor can save the file with unix/linux style line endings, instead of windows style line endings.

Oh. And if you are only using netcdf files and not grib, you do not need to do any of this.

Hi Brendan,

Thank you very much for your help, it's greatly appreciated! I've made some progress.

I've installed cygwin and copied the two cdo files into my cygwin bin file. I've added the cygwin bin folder to my system's environment variables path variable.

It seems like I'm missing 4 files to be able to run cdo correctly, however I'm unable to find these files available under the full list of packages when running
the cygwin installer. Is there a specific place where I can find these files? I've attached two screenshots of my cygwin window.

• "cygeccodes.dll" and "cdo.exe" should be put in your cygwin/bin directory, the one that the cygwin setup program created. Should be something like: C:\cygwin64\bin under windows. You do not need to create your own cygwin/bin directory.
• You will be accessing cdo from the cygwin terminal window. You do not need to add anything to your windows path. I suggest you delete the change you made to your Windows path.
• Read the installation notes for windows/cygwin (https://code.mpimet.mpg.de/projects/cdo/wiki/Win32). There are eight pre-requisite packages required by cdo. You must install them using the cygwin setup program(package installer). When you do this, the cygwin installer may also prompt that additional packages(such as hdf, which netcdf requires) are also marked for installation. This is normal. Hopefully this will do the trick. And hopefully, the cygwin netcdf and hdf packages are currently in sync. When I last installed cdo six months ago(https://code.mpimet.mpg.de/boards/2/topics/8636?r=8639#message-8639), I had to go into the cygwin installer and select hdf version:

  libhdf5hl_100 1.10.2-1

  , and netcdf versions

  libnetcdf11 4.4.1-1
  libnetcdf15 4.7.3-1

Take a few minutes to read the cygwin installer documentation before starting and then the cygwin docs on the cygwin file system. And since you will be working in the cygwin terminal, which is a bash shell, spend a few minutes reading a bash tutorial or two. As of tomorrow I won't have internet access for a few weeks, so if I do not reply again, I am not ignoring you, just enjoying summer unplugged.

And just to be certain, in your cygwin termial:

$ tail ~/.bashrc

export ECCODES_DEFINITION_PATH=~/eccodes-2.9.0-Source/definitions

/home/your_cygwin_username/.bashrc

/home/your_cygwin_username/.bashrc

Hi Brendan (and to those with a similar problem)

I had already installed the packages specified in the installation guide. However, after installing the extra packages you specified I'm able to use CDO.

Thanks again for your patience. Please enjoy your summer vacation!!

Best regards,

Neil

I linked this thread into the Win32 page - thx a lot from my side,too.

cheers
ralf

Hello!

Just read this all through to install this on my win10 station.
did everything step by step ,but cygwin terminal shows the message about missing operators although i put cdo.exe and cygeccodes.dll at the cygwin64 bin folder
any idea to get past this?

please, show the command and its error you used

here it is.

so what's the point? CDO works! You just have to provide something to do. Try

cdo -outputtab,value -topo

I had already installed the packages specified in the installation guide. However, after installing the extra packages you specified I'm able to use CDO.

I have had very similar issues. I have the correct cdo -V installed, but when I try and read a file it says "1.nc is a file on disk!". Does anyone know why this occurs?

hi Kyle!

the CDO syntax work like this: cdo <operator> <inputfile> <outputfile> Please have a look at the documentation for more examples

cheers

Thank you, I am slowly learning. Is there any reason why certain operators don't work with just 1 file (i.e., griddes)? See photo attached.

hi Kyle!

If you want to get a rough overview about how to do basic stuff, the FAQ is the perfect place to start with.

In terms of output CDO has two classes of operators:

1. operators that write to one or multiple output files
2. operators that write to stdout

The second class of operators can give you information about the input(s): griddes for grid information, sinfov for an overview of variables and coordinates, showname for printing all variable names. A complete list of this type of operators can be found in the beginning of chapter 2 of the documentation

The first class basically contains all other operators.

when in comes to input, most of the operators need one or more input files. but there are a couple of operators, that generate data out-of-the-blue: topo, stdatm, const, rand, seq to name a few.

cdo --operators

hth
ralf

Any easy to understand help or a reference to an approachable guide for beginners would be very welcome! same question

Regards, [[https://hellodear.in/]]
[[https://teatv.ltd]]

https://code.mpimet.mpg.de/projects/cdo/wiki/Tutorial ?

Hi everyone,
I have a similar problem. I added cdo.exe to the bin folder, unzipped eccodes-2.9.0-Source.tz inside cygwin and set ECCODES_DEFINITION_PATH.
When I try to install cdo I get the following warning:

C:/cygwin64/bin/cdo.exe: error while loading shared libraries: cygeccodes.dll: cannot open shared object file: No such file or directory

I understand which I get it as cygeccodes.dll is not in the bin folder but I do not understand where I can download cygeccodes.dll to add it to the bin folder, I cannot seem to find it here: https://code.mpimet.mpg.de/projects/cdo/wiki/Win32

How to I add cygeccodes.dll?

Thank you!

Lucia Layritz wrote:

Hi everyone,
I have a similar problem. I added cdo.exe to the bin folder, unzipped eccodes-2.9.0-Source.tz inside cygwin and set ECCODES_DEFINITION_PATH.
When I try to install cdo I get the following warning:

C:/cygwin64/bin/cdo.exe: error while loading shared libraries: cygeccodes.dll: cannot open shared object file: No such file or directory

No, you don't have a similar problem IMO. You want to run a cygwin binary from a plain windows command line terminal. This cannot work. Please you a cygwin terminal instead. There should a shortcut on the desktop or at least in the start menu.

hth
ralf

I understand which I get it as cygeccodes.dll is not in the bin folder but I do not understand where I can download cygeccodes.dll to add it to the bin folder, I cannot seem to find it here: https://code.mpimet.mpg.de/projects/cdo/wiki/Win32

How to I add cygeccodes.dll?

Thank you!

Hello Ralf,

thank you for your answer. I have done this inside a cygwin terminal I opened from the start menu, so I think this is not the reason.
As far as I understand, it cannot work since I do not have cygeccodes.dll where it should be, I just do not understand where to download it.
Thank you,
Lucia

ah, my fault - sorry. put cygeccodes.dll next to the cdo.exe. then it should work.

This dll is part of the official download zip file for CDO: https://code.mpimet.mpg.de/attachments/download/20825/cdo-1.9.8-cygwin64-Win10.zip

Yes it worked! I must have had a broken version of CDO download before. Thank you