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#!/bin/bash

while true
do
    select input in cpu_load disk_load
    do
        case $input in
            cpu_load)
                //
                break;;
            disk_load)
                //
                break;;
            quit)
                exit 0;;
            *)
                echo "---------------------------------------"
                echo "Please enter the number."
                echo "---------------------------------------"
                break;;
        esac
    done
done