How to add "sdfopen" and "xdfopen" commands into my GrADS

[Dave Allured]

The Grads distribution includes several different Grads executables.  It
sounds like you are using "gradsc" when you should be using "gradsnc".
This may be hidden under a symbolic link for the "grads" command.

Try just typing "gradsnc" to start up, and see if sdfopen works.

Also, check your installation.  When GrADS starts up, it prints a line
starting with "Config:".  This line should include "sdf/xdf" and
"netcdf".  If not, you are using the wrong executable.  See this
documentation, also the installation instructions about the sym link for
"grads".

  http://grads.iges.org/grads/gadoc/gradcomdgrads.html

--Dave A.
CDC/NOAA/CIRES

Ming Yang wrote:

>Hi, folks
>    My GrADS version is 1.8SL11. I would like to use it to read some
>NetCDF files. I learn from the manual that I can read these files by using
>sdfopen or xdfopen. But the problem is when I type sdfopen or xdfopen in
>my GrADS session, it is said that they are Unknown commands. Does anybody
>know why this error happen? Do these two commands come with the package or
>I have to add them by myself? And How? Thank you for your attention.
>
>Best,
>Ming
>
>