Maybe something like this 
function go
{
    if [ $1 = "--add" ];then
             
        perl -pi -ne 's/^\(UNKNOWN/($2) cd $3;;\n(UNKNOWN/' ~/.bashrc
            
    fi

    case $1 in
        (tmp)  cd $HOME/tmp;;
        (home) cd $HOME/home;;
(UNKNOWN) true ;;
    esac

}

[download]
Though actually I don't like the idea

In reply to Re: Appending in a switch case statement by zwon
in thread Appending in a switch case statement by diffredential

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