跳至主要内容

Class 3

一. shell脚本

  1. 基本语法
    •  #!/bin/bash    声明解释该脚本的程序，使用后可使用bash内建的指令
    • #!被称为魔数    魔数后应指定运行该脚本所需程序的完整路径
  2. 特点
  3. shell脚本解释器
    • bash  Linux内建的shell，BourneAgain Bash缩写，内部命令40个
      • 包含自身帮助
      • 查找匹配，命令文件名补全
      • 可用方向键查阅和快速修改
    • sh  是Bourne Shell的缩写，sh 是Unix 标准默认的shell
    • ash  占用系统资源最少的一个小shell，只包含24个内部命令,使用不方便
    • csh  内部52个命令，指向/bin/tcsh
    • ksh  与商业版相同，体会商业版乐趣
  4. 不适用shell
    • 工作量大，跨平台，安全性，GUI,直接操作系统硬件
    • 需要使用库或是遗留下来的老代码
    • 私人闭源的项目
  5. shell变量规范
    • your_name="shilizhuang"
      echo ${your_name}
    • 变量字母开头，仅包含字母、数字、下划线
二. 程序设计预言
  1. 编译型语言
    • 程序运行之前有一个单独的编译过程
    • Fortran、Ada、Pascal、C、C++和Java    需要预先将写好的源代码(source code)转换成目标代码(object code)，这个过程被称作“编译”
      • 优点：运行程序时，直接读取目标代码(object code)，由于非常接近计算机              底层，执行效率很高
      • 缺点：多半运作于底层，所处理的是字节、整数、浮点数或是其他机器层级            的对象，实现简单的功能需要大量复杂的代码
  2. 解释型语言
    • 运行的时候边转化为机器语言，因此速度不快
      • 也被称为“脚本语言”
      • 运行在比编译型语言高的层级，能够轻易处理文件与目录之类的对象

三. 环境变量

  1. 重定向（可用于备份）
    • >输出重定向
    • >>追加到末尾
    • <输入重定向
    • <<内联输入重定向

四. 自己了解的内容

  1. 引导
    • grub(目前出到grup2)
    • NT
  2. yum命令
  3. 两个案例练习




标签：

Popular posts from 产品随想的博客

《Becoming Steve Jobs》Chapter 12 Two Decisions

Jim Collins, the bestselling author of the management classics Built to Last: Successful Habits of Visionary Companies and Good to Great: Why Some Companies Make the Leap … and Others Don’t, has a wonderful phrase to describe an essential characteristic of great leaders: deep restlessness. Collins applies the phrase to Steve, one of the two great leaders who inspire him the most (the other is Winston Churchill, the great English politician who was prime minister during most of World War II, from 1940 to 1945, and again from 1951 to 1955). Collins believes this restlessness is far more important and powerful than simple ambition or raw intelligence. It is the foundation of resilience, and self-motivation. It is fueled by curiosity, the ache to build something meaningful, and a sense of purpose to make the most of one’s entire life. 自己何其有幸，在不到30的年纪，就能感受到乔布斯的心境 “The things he was trying to do,” says Collins, “were always hard. Sometimes those things beat him up. But the response to fighti...
阅读全文

Steve Jobs at 44, By Michael Krantz, 1999

Differences and Similarities Between Apple and Pixar Apple turns out many products--a dozen a year; if you count all the minor ones, probably a hundred. Pixar is striving to turn out one a year. But the converse of that is that Pixar's products will still be used fifty years from now, whereas I don't think you'll be using any product Apple brings to market this year fifty years from now. Pixar is making art for the ages. Kids will be watching Toy Story in the future. And Apple is much more of a constant race to continually improve things and stay ahead of the competition.  His Role At Pixar At Pixar my job is to help build the studio and recruit people and help create a situation where they can do the best work of their lives. And to some degree it's the same at Apple. But at Pixar, I don't direct the movies, whereas at Apple probably, if I had to pick a role out of a film production, I'd be the director. So it...
阅读全文

可能比较危险的

全网监控公司： 1）中国厦门的美亚柏科 2）KIS（Knowlesys Intelligence System） 3）除中美之外的第三大AI监控技术供应商是：日本的NEC Corporation 中国的VPN公司： 1）VyprVPN、玲珑加速器 Point： 1）被GFW屏蔽的IP，反向也会无法访问大陆网络
阅读全文

《Becoming Steve Jobs》Chapter 15 The Whole Widget

What the world did see was an effective and visionary leader at the height of his powers. These were complicated years for Apple, but Steve handled almost every challenge in exactly the manner he wanted. He had fallen into leadership at such a young age, but he was comfortable in that role now, and justifiably sure of his capacity to guide Apple’s tens of thousands of employees to the goals he set for them. During these years, he would ensure the company’s continued success in personal computers by engineering a deft switch to a new kind of microprocessor; ruthlessly and successfully managing some major transitions in his executive team; and optimizing and building upon the efficiency and ambition of the company’s product development “treadmill,” as Tim Cook describes it. This is also when he delivered what is likely to be remembered as the most notable product of his life, the iPhone, and then improved even that by pivoting once again into a strategy he personally had not wanted to pu...
阅读全文

产品随想 | 陪读《Make Something Wonderful：Steve Jobs in his own words》1976-1996

  There’s lots of ways to be, as a person. And some people express their deep appreciation in different ways. But one of the ways that I believe people express their appreciation to the rest of humanity is to make something wonderful and put it out there. And you never meet the people. You never shake their hands. You never hear their story or tell yours. But somehow, in the act of making something with a great deal of care and love, something’s transmitted there. And it’s a way of expressing to the rest of our species our deep appreciation. So we need to be true to who we are and remember what’s really important to us. ──Steve, 2007 Introduction by Laurene Powell Jobs Much of what’s in these pages reflects guiding themes of Steve’s life: his sense of the worlds that would emerge from marrying the arts and technology; his unbelievable rigor, which he imposed first and most strenuously on himself; his tenacity in pursuit of assembling and leading great teams; and perhaps, above all,...
阅读全文

360T7 刷机步骤及固件

https://cmi.hanwckf.top/p/360t7-firmware/   360T7的固件支持由immortalwrt-mt798x项目提供支持，请参考： https://cmi.hanwckf.top/p/immortalwrt-mt798x https://github.com/hanwckf/immortalwrt-mt798x 刷机步骤 参考 此处 的办法开启原厂固件的UART和telnet功能 在以下链接下载360T7测试固件（纯净版，无任何插件） https://wwd.lanzout.com/b0bt9idwd 密码:ezex （此固件已过时，请选择其它更新的固件） 接下来将刷入修改版uboot。修改版uboot的优点有： 固件分区可达108MB，原厂uboot只能使用36M 自带一个简单的webui恢复页面 到以下仓库的Release页面下载uboot，目前暂时仅支持360T7，后续将支持更多mt798x路由器。 推荐使用 mt7981_360t7-fip-fixed-parts.bin ， fixed-parts 代表uboot分区表在编译期间固定，不会随着uboot环境变量变化。 https://github.com/hanwckf/bl-mt798x/releases/latest 将 mt7981_360t7-fip-fixed-parts.bin 通过HFS等方式上传到路由器，使用以下命令刷入uboot mtd write mt7981_360t7-fip-fixed-parts.bin fip 确认刷入完毕后，拔掉路由器电源。然后将电脑的IP地址设置为固定的 192.168.1.2 ，接着按住路由器的RESET按钮后通电开机，等待8s后用浏览器进入 192.168.1.1 在uboot恢复页面选择要刷入的固件。immortalwrt-mt798x目前编译两个版本的360T7固件。 建议修改版uboot直接使用 immortalwrt-mediatek-mt7981-mt7981-360-t7-108M-squashfs-factory.bin ，两种固件区别如下： mt7981-360-t7-108M 为108M固件分区，原厂uboot不可启动，需要修改版u...
阅读全文

ISSUU使用指南--木喵

作者： 木喵   出处： Wonderworks 问：issuu是什么？ 答：Issuu是国外的一个在线文档共享网站，它是你的PDF文档发布专家。它类似于我们熟悉的youtube，但它共享的是文档、杂志之类的文本。 简而言之、同志们想看国外的各种杂志？ 想找国外的汇报文本么？ 想借鉴国外学生的作品集么？ 那么你就要用到它啦~ 今天主要和大家讲两个方面 一、如何在pc端使用和下载issuu上的pdf文档 首先我们打开issuu的网址 https://issuu.com/ 我们可以很清楚的看到网页上呢都是国外的杂志以及一些作者自己制作的pdf文档 首先我们点击右上角的 sign up  然后填写相关信息注册一个账户： 注册完成之后我们就可以搜索我们想要找的资料： 比如说，我想找一些分析图的资料，我们就搜索： architecture diagram 然后我们就可以看到相关的文档了： 点击你所选择的文档， 好了问题来了： sorry，this publication is not available 这个时候！就需要在用pc端的我们做一件必不可少的事： 翻墙 然后我们就能将页面刷新粗来了 好、接下来是非常有建设性意义的一步 怎样把我们网页上的文件 下载下来 呢？ 截图？ no~no~no~ 接下来，让木喵告诉你怎么下载： 首先你需要复制上面的网址 然后将 https://wenfan.hk/issuu/index_link.php 在另一个网址中打开 将你之前复制的pdf的网址粘贴在下面的对话框中 点击 I‘m not a robot 再点击 get it 然后会出现一堆网址代码 我们 全选 打开你的迅雷点击 新建 将你之前的复制粘贴到下载链接里 然后呢~我们就全都下载成功啦~ 然后我们回到之前的网页向下看 我们可以看到有上传文档的作者（记得要关注哟） 然后还有 info   share   stack   ❤ 如果...
阅读全文

Foobar2000 组件安装教程

 原作者 博客地址   汉化作者 Asion博客   关于foobar 2000的一些资源 前言 foobar2000 由于其软件架构特点以及开放的姿态，使得第三方很容易开发组件（component）来拓展它的功能。由于在官网下载的默认安装文件只带了少量几个默认的组件，满足不了使用的需求，例如：默认不带 ape，tta，tak 等音频文件格式的解码器，很多无损压缩格式音乐没法播放。所以自己下载安装组件是必备的基本技能。 foobar2000 的中文汉化版（Asion 汉化）为了方便使用，集成了无损压缩文件解码器以及一些其它有用的插件，安装时选上即可，不喜欢折腾的建议使用汉化版。 这里组件指的是 foobar2000 标准组件（*.dll 文件），而非 vst 插件等其它插件，姑且把组件分为两类： 官方组件： 英文版安装包自带，安装时可选择； 第三方组件：非官方自带的组件 除了 foo_input_std.dll 和 foo_ui_std.dll 这两个组件是必须的外，其它的所有组件都 非必需 的，可以随需要增删。第三方组件可以去 官网 、 官方论坛 或者 官方 wiki 去找，也可以去贴吧等地逛逛。 下载 还是要强调一下，这里说的是 foobar2000 component ，不是中文网上通常说的 vst 插件。 下载好的组件包一般是 xxx.zip 或 xxx.fb2k-component 格式的文件，也有用 7z 打包的。前两种都是 zip 压缩（只要把 fb2k-component 改成 zip 文件就变成了 zip： 包）。标准状况下压缩包里的内容结构应该是 xxx.zip yyy.dll README.txt (可能没有) LICENCE.txt (可能没有) (其它杂七杂八） 除少数外一般只有一个 xxx.dll 文件.一定要注意压缩包结构不能是: xxx.zip yy folder (文件夹） zzz.dll … 否则要解压缩，提取那个 dll 文件。 安装 方法一（推荐） 打开 foobar2000 的菜单 文件 > 首选项(file >preferences) 的 组件(components...
阅读全文

巴菲特致股东信-1976年

 笔记： 为什么选择轻资产行业：当竞争疯狂时，不会强迫加入降价大战 最终选择了费雪的思想，选择能理解的优秀企业，以合理的价格买入并长期拥有 翻译： 雪球：https://xueqiu.com/6217262310/131440258 备份：https://archive.ph/XLK0S 原文： To the Stockholders of Berkshire Hathaway Inc, After two dismal years, operating results in 1976 improved significantly. Last year we said the degree of progress in insurance underwriting would determine whether our gain in earnings would be "moderate" or "major." As it turned out, earnings exceeded even the high end of our expectations. In large part, this was due to the outstanding efforts of Phil Liesche's managerial group at National Indemnity Company. In dollar terms, operating earnings came to $16,073,000, or $16.47 per share. While this is a record figure, we consider return on shareholders' equity to be a much more significant yardstick of economic performance. Here our result was 17.3%, moderately above our long-term average and even further above the average o...
阅读全文

《Becoming Steve Jobs》Chapter 11 Do Your Level Best

As a mass-market consumer electronics device, the iPod would eventually be sold, of course, all the usual places: Best Buy, Circuit City, big-box department stores, and even the computer retailers like CompUSA. Steve disdained all these outlets. His obsession with his products continued well after they’d been manufactured. The tacky, low-margin hustle of these chains ran completely against the minimalist aesthetic of his products and the clean exuberance of his marketing. There was only one place where he really enjoyed seeing his products sold to the public: his own Apple stores, which had debuted four months ahead of the iPod. 觉得那些喧嚣、嘈杂的零售渠道，配不上自己极美的产品 Going back as far as the debut of the Mac, Steve had always groused about the way Apple computers were sold in its resellers’ stores. The way his computers were displayed and sold represented the very worst of what could go wrong when things weren’t done his way. The salespeople, always interested in quick turnover, seemed to make litt...
阅读全文