Lesson 11 Not guilty guilty ['gɪlti] adj. 有罪的:内疚的 be guilty of - He is guilty of murder. be innocent of - He is innocent of murder. have a guilty conscience have a clear conscience **guilt ** innocence It now remains for the jury to decide on the def…

一.sed  作用: sed 是一种流编辑器,它是文本处理中非常重要的工具, 能够完美的配合正则表达式使用.处理时,把当前处理的行存储在临时缓冲区中, 称为“模式空间(pattern space)”,接着用sed 命令处理缓冲区中的内容, 处理完成后, 把缓冲区中的内容送往屏幕. 接着处理下一行,不断重复, 直到文件末尾. 文件内容并没有改变,除非你使用重定向存储输出.sed 主要用来自动编辑一个或多个文件:简化对文件的反复操作: 编写转换程序等. 命令格式: sed [options] 'co…

Text I was having dinner at a restaurant when Tony Steele came in. Tony worked in a layer's office years ago, but he is now working at a bank. He gets a good salary, but he always borrows money from his friends and never pays it back. Tony saw me and…

schema(模式)一个用户下一组对象的集合,一般与用户名一致. 视图 CREATE [OR REPLACE] [FORCE|NOFORCE] VIEW view [(alias[, alias]...)] AS subquery [WITH CHECK OPTION [CONSTRAINT constraint]] [WITH READ ONLY [CONSTRAINT constraint]]; ; desc empvu80; grant create view to scott; crea…

正则就是有一定规律的字符串,有几个特殊符号很关键(. * + ? | ),我们平时不仅可以用命令行工具grep/sed/awk去引用正则,而且还可以把正则嵌入在nginx.apache.甚至php.python编程语言当中,学好正则可以让你受用无穷!一.grep/egrep 1. 语法+选项语法: grep  [-cinvABC]  'word'  filename -c :打印符合要求的行数-n :在输出符合要求的行的同时连同行号一起输出 -v :打印不符合要求的行 -A :后跟一个数字(有无…

1.1常见难记的几种运算符 1.1.1 除运算 ‘/’ 除运算的结果为小数,即浮点数. >>> 10/3 3.3333333333333335 >>> 10/2 5.0 >>> 1.1.2 整除运算 ‘//’ (1)整数的整除运算 >>> 10//3 3 >>> 10//2 5 >>> 1//2 0 >>> (2)浮点数的整除运算 >>> 10.0//3.0 3.…

原文:Is this your shirt? A:Whose shirt is that? Is this your shirt B? B:NO,sir. It's not my shirt.This is my shirt ,my shirt is blue. A:Is this shirt C's? B:Perhaps it is ,sir.C's shirt's white. A:C,is this your shirt? C:Yes ,sir. A:Here you are,catch.…

这个课程的参考视频和图片来自youtube. 主要学到的知识点有:(the same use in C/C++) 1. while loop while(i < max){} will keep executing if i < max is true, otherwise will jump out from the while loop. Possible execute 0 times. max = 5;i = 0; while(i < 5){System.out.printf(&…

What, accoroding to the author is the best way to overcome the fear of death as you get older? Some old people are appressed by the fear of death. In the young there are a justification for this feeling. Young men who have reason to fear that they wi…

0×01 信号捕获 在这篇文章中,我们将使用GnuRadio+SDR硬件对某品牌型号的无线跳蛋进行无线重放攻击的演示. 市面上常见的无线遥控工作的频段,通常工作在315Mhz.433Mhz,也有少数的会采用868Mhz.915Mhz这几个频点. 我们可以用电视棒.HackRF.BladeRF等SDR硬件来确定遥控的工作频率: 打开软件按下遥控器后,能在瀑布图上看到明显的反应: osmocom_fft -F -f 433e6 -s 4e6 gqrx 无线遥控中心频率:433870000 0×02…