Bash shell

We often read (including in the book
Advanced Bash-Scripting Guide by Mendel Cooper)
that if we pass variable names as parameters to functions,
they will be treated as string literals and cannot be dereferenced
(ie the value is not available). But this is not so, variable names
can be passed as parameters to functions and they can be
dereferenced to obtain the value of the variable with the given name.
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