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I have some parameters defined in my notebook as, for example,

a=1;
b=2;
c=3;

and I want to export these parameters to a .txt file in which I have the following text "a=1 b=2 c=3"

It doesn't matter the format I just want to have the structure "name=value". I found some information in google but none of them solved my problem. Do you know how to do it?

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    $\begingroup$ I think Save is all you need, or did I miss something? $\endgroup$ – Kuba Apr 17 at 10:58
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As Kuba said, you can use save to put the parameters in a text file.

a = 1; b = 2; c = 3

Save[NotebookDirectory[] <> "parameters.txt", {a, b, c}]

Then test this through Clearing the values

Clear[a, b, c]

What does the txt file look like?

enter image description here

Then import and use ToExpression

Import[NotebookDirectory[] <> "parameters.txt"] // ToExpression; 

Check the values of a, b and c

{a, b, c}

(* 1, 2, 3*)

In case you/other users want to change the parameters to influence the computations, I find that using Google Spreadsheet or Excel better than text files (more structure, easier for other users).

If the parameters relate to states internal to your system, I prefer to use .wdx files

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