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POUNIX : Substitute value of variable inside script
 

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    <p>I may not have got the title perfect for this question, but I am wondering if there is a way to do the following :</p> <p>Basically, I have a text file with some key value pairs and also a statement (in the same text file) which will be extracted by a shell script and which needs to also simultaneously substitute the A, B, C in the STATEMENT variable .</p> <p>To make things simple, let me provide an example. </p> <p>Here is my text file :</p> <p>File : values.txt</p> <pre><code>A=1 B=2 C=3 STATEMENT=apple A orange B grape C </code></pre> <p>Also, I have a shell script which extracts these values and the statement from the text file and uses the STATEMENT variable as a parameter to another script it calls, something like:</p> <p>Script : first_script.sh</p> <pre><code>A=`cat values.txt | grep -w '^A' | cut -d'=' -f2` B=`cat values.txt | grep -w '^B' | cut -d'=' -f2` C=`cat values.txt | grep -w '^C' | cut -d'=' -f2` STATEMENT=`cat values.txt | grep -w 'STATEMENT' | cut -d'=' -f2` second_script.sh $STATEMENT </code></pre> <p>As you can see, second_script is called from within first_script and it uses the STATEMENT variable, so what I <strong>expect to see</strong> with the second_script call is :</p> <pre><code>second_script.sh apple 1 orange 2 grape 3 </code></pre> <p>Note that "A", "B" and "C" should get substituted to their values 1, 2 and 3.</p> <p>However, what I get is still :</p> <pre><code>second_script.sh apple A orange B grape C </code></pre> <p>which is what I don't want. </p> <p>How do I make sure that A, B and C get substituted to 1,2 and 3 respectively when second_script is called from first_script ? </p> <p>Sorry to make it confusing. </p>
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    1. USuser1691717
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    1. COYou made it quite clear :) I have a question, though: Are the names A, B, and C arbitrary or fixed? I. e. in another example, could they be V, W, X, Y, and Z or are they always A, B, and C?
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    2. COGreat that you could find it clear enough ! :) They are fixed, would always be A,B and C
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    3. COYou can also source the file values.txt, so that you can directly use the vars set in it.
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      1. USfedorqui
 

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