php bash

Understanding of the Bash environment variable Parsing Vulnerability 1. What are environment variables?Both Windows and Linux programs support environment variables. Generally, environment variables are stored at the beginning of the process memory

Recently, a "destruction-level" vulnerability-Bash software security vulnerability has emerged. This vulnerability was discovered by St & eacute; phane Chazelas, a French GNU/Linux enthusiast. Subsequently, the US Computer Emergency Response Center (

1. For I in 'ls *. mp3' Common Mistakes: for i in `ls *.mp3`; do # Wrong! Why is it wrong? Because the for... in statement is segmented by space, the file name containing space is split into multiple words. If you encounter 01-Don't eat the

In Linux, how many types of executable files are available? How does one execute a program in the bash environment? Next we will analyze them one by one.1. Types of executable files in Linux: 1.1 binary executable files This type of file is the most

Shell script Programmingcompiler-------Interpreter static language: compiled language, strongly typed (variable), converted into executable format beforehand. c/c++/java/c# Dynamic Language: Interpreted language, weak type. The side explanation

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.

Bash uses special environment variables for code injection attacks Bash or Bourne again shell is a UNIX-like shell script, which may be the most common installation component in any Linux system. Since its birth in 1980, bash has evolved from a

Job Management in Bash and bash job Management I was not prepared to write this blog, because Task Management (job Management) is very common, so I feel that there is no need to write such a thing. But if you think about it, record it. Maybe someone

PHP features: the command line mode starts with version 4.3.0. PHP provides a new type of cli sapi (Server Application Programming Interface, Server Application Programming Port) support, named CLI, command Line Interface, that is, Command Line

The security practice of PHP, which must be known by system administrators, is an open source server scripting language and widely used. The Apacheweb server provides the convenience of accessing files and content through HTTP or HTTPS. Improper