bash shopt

CVE-2014-6271 Bash Security Vulnerability mac OS X 10.9 repair process, cve-2014-6271bash# DetectionOpen the command line and enter the following content: env x='() { :;}; echo vulnerable' bash -c "echo this is a test" If the following is returned, upgrade as soon as possible. vulnerable this is a test # Upgrade Check the current version. Mine is 3.2.51 (1)

Bash shell Command (1), bashshell command Address:Http://www.cnblogs.com/archimedes/p/bash-shell1.html, Reprinted, please specify the source address.Ls command Ls is used to list the contents of a directory. It is one of the most commonly used commands. The format of ls is as follows: Ls [Option] [directory name or file name] Main parameters: . Options Main Parameters-A, -- all: Do not hide any items starti

BASH: Procedural programming, in order to accomplish more complex tasks, support sequential execution, select execution, loop executionSequential execution: From left to right, execute command sequentially.Select Execute: Select to execute a different code fragment based on the execution status result of the condition (condition).Loop execution: Determines whether to enter the loop according to the execution status result of the condition (condition).

Bash and its features:　　The most recent program from the user is Shell,shell is the shell meaning, itself is an executable program. The shell in its broadest sense consists of two types of GUI and CLI.Gui:gnome,kde,xfaceCli:sh,csh,ksh,bash,tcsh,zshWhen there are multiple users logged in, there will be multiple processes that are irrelevant to each other, because for each process it only considers itself and

The technical skills here were originally from Google's "testing on the Toilet" (Tott). Here is a revised and amplified version. Script Security All of my bash scripts start with the following lines: #!/bin/bash set-o nounset set-o errexit Doing so avoids two common problems: referring to an undefined variable (the default is "") the command that failed is ignored It should be noted that some o

Http://zhidao.baidu.com/link?url=bwwK8H_9R06Kw8qpu5puh_s0Bb50YrOi9qsNvBe8ZKOteC_zfV8hJUPqIcQWJohLcH5jBgSlNJ5_ 5hqf-e1w-tlrpqnoa_zbcxdyvyzmopm The default shell of the Linux operating system is the Bourne Again Shell, an extension of the Bourne shell, called Bash, which is completely backwards compatible with the Bourne shell and adds and enhances many features based on the Bourne shell. The/bin/sh in the Gnu/linux operating system is a symbolic link

Recent bash exploits have allowed many Unix-like lying guns. The following are the relevant detection methods and remediation methods (content source Aliyun Developer Forum) ----------------------------------------------------------------------------------------------------- Bash Emergency Vulnerability Alert, please note all users who are using Linux servers. This vulnerability directly affects unix-bas

Why is the Bash Security Vulnerability a global server attack? On September 24, 2014, Bash experienced a critical security vulnerability, numbered CVE-2014-6271, that could cause remote attackers to execute arbitrary code on the affected system. GNU Bash is a Unix Shell compiled for the GNU program. It is widely used in Linux systems. Its initial function is onl

Article title: Sobell talks about the fate of bash and Linux command lines. Linux is a technology channel of the IT lab in China. Includes basic categories such as desktop applications, Linux system management, kernel research, embedded systems, and open source. [Introduction] Mark G. Sobell, author of "Linux command, editor and shell programming practice guide", talked about his own views on the fate of Linux command lines in an interview with LinuxP

configuration will be very troublesome. Even the X-Window Interfaces set by different release versions are different, and learning is also difficult. In addition, the text interface transmission speed is relatively fast during remote connection.The most important thing is that it gives you a better understanding of Linux. As a general user, only learning the operation interface can solve the vast majority of problems. But as a system manager or developer, learning shell is necessary. 3.

Introduction to Shell Script (bash) As is known to all, Unix is famous for its gadgets, using a number of simple gadgets to accomplish a job that would otherwise require a lot of software development, making UNIX the ideal system platform for many people. In many gadgets, Shell script is the most basic, powerful, and most widely used. It uses a wide range, not only from system start-up, program compiling, regular operation, Internet connection, even

Bash programming Basics I. The origin of Bash 1. What is Bash? shell Bash is GNU Bourne-again shell, which is used by most Linux distributions. Shell is an interface provided by * nix for users. The underlying layer of an operating system runs independently, The user interface is separated from the underlying layer to

I. Shell script BasicsBash scripts are similar to batching, simply by putting a lot of instructions together and providing loops,conditions, judgments and other important functions, the syntax is simple and practical to write programs, greatly simplifying the administrator'sFunctions that cannot be achieved by the graphical tools.1. Create a text file that contains the bash command. The first line of the file should be:#!/bin/

Write robust Bash scripts many people use shell scripts to complete some simple tasks and become part of their lives. Unfortunately, shell scripts are greatly affected when an exception occurs. It is necessary to minimize such problems when writing scripts. In this article, I will introduce some techniques that make bash scripts robust. How many times have you crashed the script because you didn't initializ

Summary of important Linux Knowledge mdash; understand and learn about bash hardware, kernel, and shell. we must use shell to communicate the input commands with the kernel, so that the kernel can control the hardware to work correctly. The operating system www.2cto.com is actually a group of software, because this group of software is under control... summary of important Linux knowledge points-to understand and learn

Article title: Bash's most common activation mode. Linux is a technology channel of the IT lab in China. Includes basic categories such as desktop applications, Linux system management, kernel research, embedded systems, and open source. The most common activation modes of Bash are interactive and non-interactive: 1. interactive activation The standard input and output are connected to the terminal. There are three types: login, non-login, posix, and