bash shopt

Tags: bash first knowledge1.Linux System Terminal OverviewServer Terminal switch: Ctrl + Alt + F1 ... F6Virtual Machine Terminal switch: Ctrl +shift +alt +f1 ... F6The virtual terminal is generated by the mingetty program//物理机执行为本地终端[[emailprotected] ~]# tty/dev/tty1//通过网络使用模拟终端远程连接Linux, 日常运维中就是这种方式。[[emailprotected] ~]# tty/dev/pts/12.Linux System Bash ManagementIn a nutshell, the shell is the user interf

Bash security vulnerabilities are more serious than heartbleed attacks. RedHat finds a computer software system vulnerability named Shellshock (or Bash Bug), which is no less serious than the "heartbleed" vulnerability in OpenSSL software. It is estimated that this vulnerability may affect the normal operation of more than 50 thousand computer devices. Researchers found the shellshock vulnerability in the

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 actually the kernel of the operating system, t

Article title: Linux programming-11. ShellScript (bash) -- (2) Tutorial example. 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. "Hello world" Shell Script According to the traditional program teaching example, this section describes how to write "Hello World" of Shell Script. 　　 　　 　　 -----------------------------

This article mainly introduces the shell scripts used to fix bash vulnerabilities. This article is applicable to common linux server systems, such as CentOS, Debian, Ubuntu, OpenSuSE, and Aliyun, you can find a shell script to fix the bash vulnerability by searching for information on the Internet. I think it is good. I will drag it to my blog to share it with you. Script content: The Code is as follows:

Write a robust bash scriptMany people use shell scripts to accomplish simple tasks and become part of their lives. Unfortunately, shell scripts can be very much affected by running exceptions. It is necessary to minimize such problems when writing scripts. In this article I'll cover some of the techniques that make bash scripts robust.Using Set-u www.ahlinux.comHow many times have you crashed the script bec

Bash Vulnerability Hardening Scheme1Vulnerability DescriptionThe previous period of time to do security reinforcement, using the BVS scan host, according to the scanned report shows that there are two Bash vulnerabilities, respectively:① GNU Bash environment variable Remote Command execution vulnerability (cve-2014-6271)The GNU

Linux File Max connections --- bash: ulimit: open files: cannot modify limit: Operation not permitted Problem description: logon system error,-bash: ulimit: open files: cannot modify limit: operation not permittedLast login: Thu Aug 23 14:42:27 2012 from 10.6.90.41-bash: ulimit: open files: cannot modify limit: Operation not permitted-

Before giving you a detailed introduction to the Linux Bash command, let's first understand the Bash command, and then give a comprehensive introduction to the Linux Bash command, hoping to be useful to you. You can edit events in the historical event list on the command line. Table 10-3 lists the operations performed to query the historical event list. Table 10-

2014-01-09 WCDJ I have previously summarized an article on implementing Web Services using Perl, "Web server implementation (minimal Perl Web server)." Interacting with the CGI interface is often required at work, and when the dependent interface is not yet implemented, it is possible to write a simple CGI interface to emulate the dependent interface to complete debugging. Bash is also one of the scripts you use daily, and this article summarizes how

Document directory Task: display current bash prompt (PS1) Task: modify current bash prompt Task: add colors to the prompt Task: how to make the prompt setting permanent Tput command Handy tput commands Colors {code} code for tput command Q. How do I change the color of my shell prompt under Linux? A. YouCan change the color of your shell prompt to impress your friend orMake your own life quite e

Bash has recently exposed a serious vulnerability, which affects almost all Linux systems on the market. From the security perspective, the customer requires that the vulnerability be repaired for each affected host. As the company uses a Red Hat system, security is also affected. (Digress: Red Hat Patches can be downloaded only after they are paid. As a poor person, I am helpless. I asked the company if I didn't buy the Red Hat service. The Red Hat

Install bash shell and solarisbashshell on solarisA bash vulnerability exists in earlier versions of sun solaris, which can be solved by uninstalling or upgrading.1. All pkg installation packages:Http://mirror.opencsw.org/opencsw/allpkgs/ 2, download Installation :#Gunzip bash-4.3.33,rev1_2015.02.15-sunos5.10-sparc-csw.pkg.gz#Pkgadd-d

Structure of the while, until, case, and select statements in bash Case statement: Use the case structure in the script:Case $ {VAR_NAME} inPATTERN1)COMMAND...;;PATTERN2)COMMAND...;;...EsacPATTERN can be the following types of characters:1. common text characters2. Globbing-style wildcard:*: Any character of any length? : Any single character;[]: Any single character in the specified range;[^]: Any single character out of the specified range;3. |Or ch

Windows10 running Ubuntu Bash onApril 6, 2016, Windows Insider Preview released version 14316, added Ubuntu Bash, on Windows to provide a Linux environment, you can directly execute the linux command.I used to have Linux emulator app Cygwin on Windows and compiled Linux commands into executable files under Windows with the Cygwin app.This Win10 further, adding the Linux emulator to the kernel, providing sup

Under the AIX system, the default is not to install bash environment, for the regular operation of the maintenance personnel, very inconvenient, so let's install bash.1. Confirm if bash is installed on the systemMethod 1: Bash between commands, if prompted without this command is not installedMethod 2:rpm-qa|grep Bash2

Sequential execution: Default rule, execution of each statement by clauseSelect execution: Branch, condition judgment, and qualified branch to execute;Loop execution: The same piece of code is repeatedly executed for a finite number of times, so the loop must have an exit condition or it will fall into a dead loop.Program code: statement and expression compositionControl statements:Bash loop control statement: for while untilFor loop:for var_name in list; DoStatement 1Statement 2...DoneLoop add

Linux Bash getting started learning notes, linuxbash learning notes It is very useful to learn shell programming well. You can use shell scripts to easily complete interesting work. Address: http://www.cnblogs.com/yhLinux/p/4047516.html Bash instanceBy Daniel Robbins (drobbins@gentoo.org), President and CEO, Gentoo Technologies, Inc. This article is divided into three parts, starting from a simple introdu

Iii. Command HistoryBash has absorbed a lot of essence from the Korn shell and the C shell, one of which formally holds the feature of a cached copy of the executed command, which we call the "command history" feature.Why should we use the command history feature?After each user login succeeds, especially after login with file interface such as bash, all operations are implemented by executing commands, it is inevitable to repeat a command, if each co

Command editing ability (history):One of the great features of Bash is that "he can remember the commands he used!" "This is a really great feature!" Because I just press "up and down" in the command column to find the front/rear input command! In many distribution, the default command memory function can reach 1000! In other words, almost all of the commands you have issued have been recorded.Where are all the commands recorded? In your home director