"Unprocessed input" error using `cdo` in loop with variable

Question

I am trying to embed a cdo line in a shell script with variables. As a command line it works, but not in a script. This is the cdo line:

cdo -expr,'T_mask=((T > 200 ))' file_in.nc file_out.nc

In the shell script I want to run it for three different temperature thresholds, e.g. 200, 250, 300.

This is the code:

T_string='T_mask=((T > '
fileA='file_in.nc'
fileB='file_out.nc'
for T_var in 200 250 300; do
    cdo_string="'$T_string$T_var))'"
    cdo  -expr,$cdo_string  $fileA $fileB
done

I get the following error:

cdo (Abort): Unprocessed Input, could not process all Operators/Files

What did I miss? Are the hyphens set right?

Please revise the question and either: 1) remove the reference to `echo` if it's not relevant, or 2) if it is relevant include `echo` in the actual code. — agc, Jun 22 '20 at 13:07

score 2 · Accepted Answer · answered Jun 17 '20 at 15:49

2

The $T_string variable seems needless. When using similarly named shell variables, always use curly braces.

Try this:

fileA='file_in.nc'
fileB='file_out.nc'
for T_var in 200 250 300; do
    cdo  -expr,'T_mask=((T > '"${T_var}"'))'  "${fileA}" "${fileB}"
done

answered Jun 17 '20 at 15:49

agc

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Great! It works now with the curly braces. Thanks a lot :D – Zeusuez Jun 22 '20 at 12:46

"Unprocessed input" error using `cdo` in loop with variable

1 Answers1