In bash, how to store a return value in a variable?

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Simplest answer:

the return code from a function can be only a value in the range from 0 to 255 .
To store this value in a variable you have to do like in this example:

#!/bin/bash

function returnfunction {
    # example value between 0-255 to be returned 
    return 23
}

# note that the value has to be stored immediately after the function call :
returnfunction
myreturnvalue=$?

echo "myreturnvalue is "$myreturnvalue

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