Is there more elegant way to write statement with overlapping (nested) alternatives?

Question

I want to write case statement with overlapping alternatives.

Quick search on the internet gives me examples with alternatives which is unique and not overlapping, smth like:

case $var in
    a) <code> ;;
    b) <code> ;;
    *) <code> ;;
esac

But I need scenario where one alternative contains several alternatives and additional work. I figure it this way:

case $loglevel in
    [0-7]) <code>
           case $loglevel in
                [0-3] <redirect to /dev/console> 
                ;;
                [4-7] <redirect to /dev/null> 
                ;;
           esac
    ;;
    *) <code> ;;
esac

I guess is there any more elegant or rational way to do this. It seems for me that nested case statement for such simple scenario is too much.

Answer 1

If your shell is modern enough, you can use ;;& instead of ;; to try the following conditions even if the current one succeeded:

#! /bin/bash
loglevel=$1
case $loglevel in
    ([0-7]) echo 0..7
            ;;&
    ([0-4]) echo 0..4
            ;;
    ([5-7]) echo 5..7
            ;;
    (*) echo Ohter
esac

Which gives

▏~ $ 1.sh 1
0..7
0..4
▏~ $ 1.sh 6
0..7
5..7