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Environment variables can have any value, it depends upon how you use them in your scripts. in simple shell scripts you can set a variable to a sequence separated by spaces (the default, lookup the IFS shell variable: https://en.wikipedia.org/wiki/Internal_field_separator) and then process them as a list, e.g.
F="a b c"
for i in ${F}
do
echo $i
done
When you set the variables value in pipelines, there is no need for the '"'s - only when you set it in the shell.
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