You can do it by creating a gs-file (i.e. GrADS script). Syntax of a gs-file is very similar to syntax of VB, if you are familiar with.

An important note: when you open multiple nc-files in GrADS, you have to use an numeric indicator at the end of variables names of the 2nd, 3rd,... files. For example, you have to use x, x.2, x.3 for the variables of the 1st, 2nd and 3rd nc-files.

Thank you Mr. Alireza Araghi for responding my query. Actually I have files in hundreds and I don't want to open those one by one. I am looking for some command/function which could extract all names of files from target directory. Then I can use loop to access each file.

Grads does not have such functionality. You can do that, however, using a script that executes "command line" instructions... but it will depend on your operating system.

In my case, I ran grads on a linux machine, and I do exactly what you want with the script below. The important parts are:

1) you gotta have a CTL file for each of your netCDF

2) you execute a "list" command on your shell with the "!" (exclamation mark) to generate a list of the files of interest

3) Because grads cannot handle the output of this temporary shell-calls, you have to save the result into a file.

4) you then read the file, and get the results you need.

NOTE1:

I did this a long time ago. If now grads can open .nc files direclty, you can easily change the code below to list the *.nc files, instead of the *.ctl files.

NOTE2:

If all your files are "the same", but differ only in the time interval... then you can probably do better by writting a CTL template and opening just one CTL file.

Best regards,

Henrique

function xdfopenall(dir)

reinit

* check if anydir was informed

if (dir=''); dir='.'; endif

* create file list

'!/bin/ls 'dir'/*.ctl 'dir'/*.CTL 'dir'/*.Ctl > openall.list 2> /dev/null'

* read first line

rc=read('openall.list')

ok=sublin(rc,1)

lin=sublin(rc,2)

* process all lines

while (ok=0)

arq=subwrd(lin,1)

'xdfopen 'arq

* read next line

rc=read('openall.list')

ok=sublin(rc,1)

lin=sublin(rc,2)

endwhile

'q files'

say result

rc=close('openall.list')

'!rm openall.list'

*fim

Henrique Barbosa and Waqas Qazi,

Thank you both of you for providing guiding steps. I have already installed Bash on Ubuntu on Windows to run wget scripts. Let me start working on grads script.