Is there a tool to eliminate a variable from an exodus file?

[bartgol]

I have an exodus file, and I would like to remove a variable from it. Is there a tool shipped with SEACAS that allows it? I looked at explore, but I couldn't really figure out if it's possible.

My first guess was to use nco tools (ncks, specifically) to remove the variable, but then I would have to

• "shift" all the variableN that came after my var to a lower index
• resize the names_nod_var field, shifting names "left" as needed
• update the num_nod_var dimension

and similarly for elem vars. I figured "maybe someone else already wrote a script for this?".

@trilinos/seacas

[gsjaardema]

You can use the algebra code to do this. Syntax is:

algebra {input_file} {output_file}
save all
delete {variable_to_delete}
exit

Some documentation is at https://sandialabs.github.io/seacas-docs/sphinx/html/index.html#algebra

[bartgol]

@gsjaardema Is there a way to run this inside a script? That is, can one forward the commands (like save all) to the ALG runtime in a non-interactive way? I'm trying to delete a var as part of a testing workflow...

[jhux2]

Is there a way to run this inside a script?

@bartgol When I needed to automatically verify that thousands of parallel mesh files were not corrupt with the SEACAS explore tool, I resorted to some bash trickery. Maybe you could adapt this for your case. Here's what I did:

#!/bin/bash

for f in *
do
  export flag=`explore $f <<< check |& egrep "Database check is complete" | wc -l`
  if [ "$flag" -eq "1" ]; then
    echo "$f : ok"
  else
    echo "$f : BAD"
  fi

done