bash computer

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Bash script (bashmap): a function to complement bash without hashmap __ function

@2013/7/19 -Add the bashmap_clear command to delete the key or empty the entire map. Step 1: Add the function to the bash script (or. bashrc) # for Bashmap {# echo MD5 code for $ MD5 () {if [x "$ = = X"] then echo "" Else echo "| Md5sum-| Cut-c 1-32 fi} # Usage # > Bashmap "Key" "Value" # set Map[key] = value. # > Bashmap "key" # Print Map[key] Bashmap () {wx_bashmap_prefix= "BASHMAP_" Export Wx_bashmap_prefix md5key=$ (eval "MD5") case "$#" in

Explains the security vulnerability process caused by bash Code injection.

Recently there has been a "destructive level" vulnerability--bash software security vulnerabilities. The loophole was discovered by French gnu/linux enthusiasts Stéphane Chazelas. Subsequently, the United States Computer Emergency Response Center (us-cert), Red Hat and a number of companies engaged in safety in Wednesday (Beijing time September 24) issued a warning. Details of this vulnerability are availab

Basic analysis of Linux operating system (vii)--bash basic knowledge and basic usage skills (1)

In everyday English, the shell can be translated into shells, most of which means a device or structure that can protect the inner core. In computer science, the shell actually refers to a provider that can use the entire computer's resources through system calls or library calls.It is both a command parser and a programming language. As a command parser, it can interpret and execute user-entered commands, and can automatically interpret and execute a

BASH learning notes

operation Integer Operation string operationSame-eq =Different-ne! =Greater than-gt>Less than-lt Greater than or equal to-geLess than or equal to-leBlank-zNot empty-nFor example:If the integers a and B are equal, write if [$ a = $ B].To determine whether integer a is greater than integer B, write if [$ a-gt $ B].Compare whether the strings a and B are equal to write: if [$ a = $ B]To judge whether string a is null, write: if [-z $ a]To determine whether integer a is greater than B, write: if [$

Bash instance, Part 1: Exploring the ebuild System

executed. When user_compile () is executed,/etc/ebuild. conf has been executed, and "$ makeopts" has been set to the correct value. ConclusionThis article has already talked about many bash programming techniques, but it only involves some of the capabilities of bash. For example, Gentoo Linux ebuild not only automatically unpacks and compiles each package, but also: If no source code is found in "$ DIS

BASH Learning notes Summary _linux Shell

following table: The corresponding operation integer operation string operation Same-eq = Different-ne!= Greater than-GT > Less than-lt Greater than or equal to-ge Less than or equal to-le Is null-Z Not null-n Like what: Compare integers A and b for equality and write if [$a = $b] To determine if an integer A is greater than integer b, write if [$a-gt $b] Compare strings A and b for equality on writing: if [$a = $b] To determine if a string A is empty, write: if [-Z $a] To judge whether an int

Bash Security Vulnerability threats are more likely than "heartbleed", with faster update!

650) This. width = 650; "src =" http://s3.51cto.com/wyfs02/M00/4A/2A/wKioL1QjgXjCgIliAAD8C0Av2tY574.jpg "Title =" 11.jpg" alt = "wkiol1qjgxjcgiliaad8c0av2ty574.jpg"/> According to foreign media reports, network security experts warned on Wednesday that a frequently-used section "bash" in open-source software Linux has recently discovered a security vulnerability, its threat to computer users may exceed the

What should I do if my computer is poisoned? Procedures for processing viruses on your computer! What should I do if my computer is infected with viruses? Computer Virus symptoms! How do you know computer poisoning?

Computers are connected to the network every day. Nowadays, there are countless Trojan viruses on the network, and viruses will inevitably happen one day. So what should we do after the virus? The correct solution can avoid greater losses and minimize the damage caused by viruses. Let's take a look. I. MediumVirusSymptom When your computer is infected with viruses, the virus will not tell you that the virus has been poisoned. We can see from some abno

Bash basic programming Summary

function name. The previously defined function can be called directly using hello. For a function with parameters, you only need to give the parameters following the function name in sequence, for example, func_name arg1 arg2. Function Parameters When a function is called, parameters can be passed to the function. How can we obtain these parameters in the function body? Function parameters are obtained by $1, $2, and so on. For example: Function add (){N = $1M = $2Echo $ (n + M ))} Call Add 1

Bash Programming Summary

Bash should be the most popular shell scripting interpreter on Linux today (and a shell called dash, I hate this stuff too much.) As long as you work on Linux and want to work more happily, you should be familiar with the most basic bash programming, because it will give you enough happiness to work. This article will summarize some of my own usual bash basic pro

Understanding and learning BASH and shell

BASH includes: setting variables and using the bash operating environment to build a data stream redirection function pipeline command bash command line is indispensable for host maintenance and management help 1.1 understand bash, shell, which manages computer hardware is a

Linux Bash Shell Programming Quick Start

Basic syntax for BASH The simplest example of--hello world! About input, output, and error outputs Rules for variables in BASH (similarities and differences with C language) Basic Process Control syntax in BASH Use of functions 2.1 Simplest example of--hello world!Almost all of the first examples of programming books to readers are t

Bash remote parsing command execution vulnerability Test Method

Bash remote parsing command execution vulnerability Test Method Since yesterday, the BASH remote command execution vulnerability from a vast ocean of Australia has boiling the entire FreeBuf. Everyone is talking about it, "The Heart of the Internet is bleeding again, how can I test my website? The following script $ env x=‘() { :;}; echo vulnerable' bash -c "ec

[Linux] Basic syntax for BASH

The simplest example of--hello world! About input, output, and error outputs Rules for variables in BASH (similarities and differences with C language) Basic Process Control syntax in BASH Use of functions 2.1 Simplest example of--hello world!Almost all of the first examples of programming books to readers are the Hello World program, so let's start with this example today to learn more

The difference between terminal, shell, bash

all operations in the computer, responsible for the processing of human interaction, execution of scripts, etc., is the operating system is an important part of the normal operationBASH,ASH,ZSH,TCSH is a concrete implementation of the abstract concept of the shell, which is a program that can generate a process object.If you want to change the shell of the program, you can modify the/etc/passwd, the inside of the/bin/

Features of bash in Linux

rows in the file -W to show only the number of words in the fileXi. Input/Output redirectionWhen using a computer, the body that implements a function is a programprogram = instruction + dataThe data is criticalEntities that can complete input and output functions in a Linux system: fileDevices that can be used for input: FilesKeyboard equipment, file system of the regular files, network card equipment, sound card equipment, disk equipment, etc.;Devi

Linux Bash critical bug fix method

. But this does not mean that, like other users on the network can get control of the computer, although the hacker exploited the vulnerability does not have control rights, but it is easy to leak computer-related information, so as to facilitate the hacker attack, so the vulnerability is still very dangerous. However, as long as it is a shell loophole, it is very dangerous. Shell as a bridge between human

(2) bash shell?

1. What is shell? In fact, I have heard of shell before I came into contact with Linux. At that time, I was talking about shell programming and I knew nothing about it. But surprisingly, I remember this term when my memory is really bad. Okay, let's talk nonsense. In the previous article(1) Linux?Ubuntu or centos? Linux Installation. Computer users communicate with the kernel through the interface (shell, Kde, etc.) to control

Bash vulnerabilities need to be supplemented

I. Use the Yum-downloadonly plug-in Yum install Yum-downloadonly-y II, Yum update Bash -- downloadonly -- downloaddir =/var # automatically downloads the bash version of the corresponding system to the/var directory. Ll/var/bash-4.1.2-15.el6_5.1.x86_64.rpm SCP bash-4.1.2-15.el6_5.1.x86_64.rpm to other machines of the

Bash under Linux

Basic syntax for BASH The simplest example of--hello world! About input, output, and error outputs Rules for variables in BASH (similarities and differences with C language) Basic Process Control syntax in BASH Use of functions 2.1 Simplest example of--hello world!Almost all of the first examples of programming books to readers are t

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