bash shopt

recall that we talked about user management, rights management, and also introduced two commands, one is the install command, the other is mktemp, here we do not do more introduction.For user management, it is the allocation of the resources of the permission to their isolation.For permissions, it is the permissions that the logged-on user of the system should have assigned to the resource.So we'll cover the bash feature and the initial programming of

#!/bin/bash refers to the script that uses/bin/bash to interpret execution. Where #! is a special representation, followed by the shell path that explains the script. Bash is just one of the shells, and there are many other shells, such as: Sh,csh,ksh,tcsh,... We can experiment with one of the following examples to understand the use of #!/bin/

Bash Vulnerability Detection Methods You can run the following command to check whether the system has this vulnerability (running in the local Bash environment ):Shell 1, CVE-2014-6271, Test method:Env x = '() {:;}; echo vulnerable' bash-c "echo this is a test"If the execution result is as follows, the vulnerability exists:VulnerableThis is a testAfter the shell

BashIs the default shell script of the Linux operating system. Shell is a program used to process operating system and user interaction. Shell scripts can help users automate interaction with the operating system. You can also understand it as a script-based programming. Now that programming is available, the compiler, interpreter, and debugger of the program are essential, and bash is the same. However, there may be something different from the progr

First bash, although there are if_else, can tune the system commands. But many limitations, such as not supporting multi-threading, have no libraries. So it's not necessary for PY or Ruby to learn bash again. Reply content:Daily work, a lot of things are very trivial and detailed, you can not imagine you will encounter any specific small task. At this point, you can't always open vim and write a Python scri

From: http://www.linuxdiyf.com/viewarticle.php? Id = 105505 I bet you are reading this article. more than 99% of the possibility is that you are wrong about this problem, or at least there is a deviation.I believe that this is a broad mistake in the Education Law, that is, to tell everyone:If [condition]Then...FiThis is the "Syntax" of the Condition Statement in bash ".Anyone, or almost anyone, will naturally think that [and] are part of this syntax s

This article experiences the use of Git bash on the Windows operating system.What is bash?is a shell environment, Bourne Again shell abbreviation.install git for Windows→http://git-for-windows.github.io/→download, choose a suitable version→ Installation→ After installation there are git Bash, git CMD, and git GUI this three application→ Run git

# # # Yesterday also said the legend to another patch, today is all out. The basic operation is consistent with the test results are different. continue to fix bash vulnerabilities for the Debian7 wheezy version number, such as the following:1, test whether the need to upgrade# env x= ' () {:;}; Echo vulnerable ' bash-c "echo this is a test" #显演示样例如以下, upgrade requiredVulnerableThis is a test2. Offline upgr

Bash-shell Startup File Linux uses environment variables to identify itself in programs and scripts. This provides a simple way for your program to obtain system information. The question is how to set these variables. When you log on to Linux and start a bash shell, bash searches for and runs commands in several files by default. These files are called Startup f

　　1. Initial knowledge of Bash　　Start by compiling a simple bashVim Hello. SHUsing Vim to edit hello.sh, enter the following code and Save:#!/bin/bashecho Hello WordHow to run the Bash script:sh hello. SH # Use Bash to execute bash hello. SHYou can also have executable permissions on the script itself, which chmod can

Note that if the user's shell is/bin/sh, it needs to be modified to/bin/bash!! Usermod-s/bin/bash User NameKali Linux System corresponding configuration file is/ETC/BASH.BASHRC, different release version may be differentStep one: VI/ETC/BASHRC added as follows:histfilesize=2000histsize=2000histtimeformat= "%y%m%d-%h%m%s:"Export Histtimeformat#export prompt_command= ' {command=$ (History 1 | {read x y; echo

Original address: http://www.cyberciti.biz/faq/bash-shell-change-the-color-of-my-shell-prompt-under-linux-or-unix/ ----------------- BASH Shell:change The Color of my Shell Prompt Under Linux or UNIX by VIVEK Gite on October 6, 2006 How does I change the color of my shell prompt under Linux or Unix operating systems?Can change the color of your shell prompt to impress your friend or to make your own life q

Perfect Bash History Audit 1. Download the bash-4.2 version source package, modify the source code to recompile the installation: wget http://mirrors.ustc.edu.cn/gnu/bash/bash-4.2.tar.gz 2. Modify the Config-top.h file in the root directory of the source package. #define SSH_SOURCE_BASHRC#define Syslog_history Rem

Many people use shell scripts to accomplish simple tasks and become part of their lives. Unfortunately, shell scripts can have a very large impact when they run an exception. It is necessary to minimize this type of problem when writing scripts. In this article I'll introduce some of the techniques that make bash scripts robust. Using Set-u How many times have you crashed a script because you didn't initialize the variable? For me, many times.

Tags: max ISS ror span post img In addition to debug echoLinux Shell Bash with special meaning exit code purpose descriptionThe exit command exits the current shell and can terminate the current script execution in a shell script.Common parametersFormat: Exit nExit. Set the exit code to N. (cause the Shell to exit with a status of N.)Format: ExitExit. The exit code is unchanged, which is the exit code for the last command. (If n is omitted, the exit s

The latest Basic Bash vulnerability repair solution Bash broke the remote parsing Command Execution Vulnerability (CVE-2014-6271), spread to the major Linux distributions and MacOSX system. Attackers can remotely execute arbitrary commands in Bash-supported Web CGI environments. After bash injection is made public, att

Article title: alias shell Bash in the network classroom. 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. Alias -- TurboLinux network classroom Another way to make work easier is to use command aliases. The command alias is usually abbreviated to other commands to reduce keyboard input. Command format: 　　 Alias [

Introduction to shell-bash programming parameters When you log on to the system, you have started to use bash, but we can also start bash on the command line:1. Bash parameter descriptionThe bash command format is:Bash [parameter] [file name]The meanings of parameters are a

Introduction to Linu Bash In Linux, shell is basically bash by default. Below are some tips I have summarized. Background running programs() Use a sub-shell, such as (cd.../../commlib/; make)$ () Command replacement, same'' Example:For example, you need to use the awk script in the shell script.Awk-f /Abc /{Print $0;}EOF) $ () Perform integer calculation $(66/2 )) If (arithmetic operation ))If [[String ope

Offers: Zstack cloud computingContent IntroductionCommand-line operations are undoubtedly the most time-consuming process when managing Linux servers. For most users, this means a lot of time to manipulate the bash shell.While most distributions offer default user types and root prompts, customizing our own prompt will undoubtedly help introduce more usage preferences. You can include a variety of practical information to help you perform tasks more s