In a Linux shell how can I process each line of a multiline string?

Question

While in a Linux shell I have a string which has the following contents:

cat
dog
bird

and I want to pass each item as an argument to another fu

Answer 1

Do like this:

multrs="some multiple line string ...
...
..."

while read -r line; do
    echo $line;
done <<< "$mulstrs"

Variable $mulstrs must be enclosed in double quotes, otherwise spaces or carriage returns will interfere with the calculation.