function version_lt () { test

经过优化的代码如下：

function version_lt () { test "$(sudo echo "$@" | tr " " "\n" | sort -rV | head -n 1)" != "$1"; }

do_conf_check() {
    # new_release为输入参数，old_release通过 ovs-appctl buildinfo 获取
    new_release="$1"
    old_release=$(sudo ovs-appctl buildinfo | grep Release | awk -F 'tianchi' '{print $2}')
    
    # 检查版本是否满足升级条件：old_release < 24_08_3，new_release >= 24_08_3
    if version_lt "$old_release" "24_08_3" && (version_lt "24_08_3" "$new_release" || [ "24_08_3" == "$new_release" ]); then
        declare -A conf_map=(
            ["/etc/cns.conf"]="/apps/conf/tianchi-openvswitch/cns.conf"
            ["/etc/pmd.conf"]="/apps/conf/tianchi-openvswitch/pmd.conf"
        )
        
        for key in "${!conf_map[@]}"; do
            value="${conf_map[$key]}"
            
            if [ -f "$value" ]; then
                sudo cp "$value" "$key"
                echo "$value has been copied to $key"
            else
                echo "$value does not exist"
            fi
        done
        
    # 检查版本是否满足降级条件：new_release < 24_08_3，old_release >= 24_08_3
    elif version_lt "$new_release" "24_08_3" && (version_lt "24_08_3" "$old_release" || [ "24_08_3" == "$old_release" ]); then
        declare -A conf_map=(
            ["/apps/conf/tianchi-openvswitch/cns.conf"]="/etc/cns.conf"
            ["/apps/conf/tianchi-openvswitch/pmd.conf"]="/etc/pmd.conf"
        )
        
        for key in "${!conf_map[@]}"; do
            value="${conf_map[$key]}"
            
            if [ -f "$value" ]; then
                sudo cp "$value" "$key"
                echo "$value has been copied to $key"
            else
                echo "$value does not exist"
            fi
        done
        
    fi
}

这是对原有代码进行了一些修正和调整，使其更加符合bash语法规范，并且增加了对配置文件是否存在的检查。请注意，以上代码仅供参考，请在实际使用前自行测试和验证。

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