# when you use 'dpkg -i $software' failed, you can install the dependency of this software by # this command apt-get install -yf…

# switch one tag # warning: if do that, can't commit any change git clone $project_path git checkout $tag_name # switch one tag, but can change the files on this tag git checkout -b $branch_name $tag_name if you have the project in local disk, how to…

世界是普遍联系的,任何事物和个体都直接或间接相互依赖,在时空长河中共同发展.在面向对象的世界中,更是如此,类与类之间的依赖,关联关系,模块(亦或是分层架构中的层)之间的耦合关系,都是我们在软件开发实践中,时刻在处理着的联系. 在软件开发中,我们一直尝试弱化这种联系,以便让软件程序更健壮,更灵活,便于维护和升级.从面向过程遍程中提倡方法的分离(过程分离),到面向对象开发中的减少类依赖,层间低耦合,层内高类聚,无一不体现了这一点.正因为在面向对象的世界中,我们更容易处理类(对象),模块(或层)之间的…

Ubuntu下使用cups共享打印机, 是一种简单易用的方法.CUPS(Common UNIX Printing System,通用Unix打印系统)是Fedora Core3中支持的打印系统,它主要是使用IPP(Internet Printing Protocol)来管理打印工作及队列,但同时也支持"LPD"(Line Printer Daemon)和"SMB"(Server Message Block)以及AppSocket等通信协议.(From baike.b…

How to upgrade Debian 8 Jessie to Debian 9 Stretch Contents 1. Objective 2. What's New 3. Preparations 4. Jessie Full Upgrade 5. Update Package Repository to Debian Stretch 6. Upgrade to Debian Stretch Simulation 7. Upgrade to Debian Stretch Objectiv…

Objective The objective is to install the NVIDIA drivers on Ubuntu 18.04 Bionic Beaver Linux. This article will discuss three methods of Nvidia driver installation in the following order: Automatic Install using standard Ubuntu Repository Automatic I…

前言 nonebot 是一个 QQ 消息机器人框架,它的一些实现机制,值得参考. nonebot NoneBot 初始化(配置加载) 阅读 nonebot 文档,第一个示例如下: import nonebot if __name__ == '__main__': nonebot.init() nonebot.load_builtin_plugins() nonebot.run(host='127.0.0.1', port=8080) 首先思考一下,要运行几个 QQ 机器人,肯定是要保存一些动态的…

While using the apt-get command or the relatively new APT package management tool in Ubuntu Linux or its derivatives such as Linux Mint (which I actually use as my primary operating system for doing daily work), you might have encountered the error –…

操作 获取需要的deb包 #执行安装后,安装的包会保存在/var/cache/apt/archives 目录下 apt-get install vim #查看 正在处理用于 man-db (2.8.7-3) 的触发器 ... root@lenovo:/var/cache/apt/archives# ll 总用量 6740 drwxr-xr-x 3 root root 12288 12月 23 10:44 ./ drwxr-xr-x 3 root root 4096 12月 23 10:44 ..…

How to compile and install Linux Kernel 5.1.2 from source code Compiling a custom kernel has its advantages and disadvantages. However, new Linux user/admin find it difficult to compile Linux kernel. Compiling kernel needs to understand few things an…