learning bash shell amazon

Shell variables are used to store the specific parameters (values) that the system and the user need to use, and these parameters can vary according to the user's settings or changes in the system environment."The role of variables"Provides specific parameters for flexible management of Linux systems, with two layers of meaning:1. Variable name: Using a fixed name, by the system preset or user-defined2. Variable value: Can change according to user's s

NULL, PRIMARY KEY (' Provinceid ') ) Engine=myisam auto_increment=1 default Charset=utf8; Run all under the specified folderSQL Scripts (Specify folders, multiple SQL scripts) for shell scripts: #!/bin/bash #Author: chisj #Time: 2015.7.22 #Describe: Create Database Table #The username of MySQL Database user= "root" #The password of MySQL database pass= "Dragonwake" #The datebase name would be Crea

-gnu ") ' Declare-ir euid=" "Declare-ir ppid=" 2162 "Declare-r shellopts=" Braceexpand:emacs:hashall: Histexpand:history:interactive-comments:monitor "Declare-r tip=" Hello world! " Declare-ir uid= "1000"2) Environment variables　　　Environment variables are used for all user processes (often referred to as child processes), and the logon process is called the parent process. User processes executed in the shell are called child processes. Local variabl

Loops in a loop shell are mainly for,while,untile,select for 1, list for loop for VARIABLE in (list) do Command Done example: Loop print John's favorite fruit for fruit in apple orange banana pear Do echo "$fruit is John's favorite" Done echo "No more fruits." Note: In inside can be the standard output of any command such as: fruits= "apple orange Banana pear" Seq 1 2 #产生1到100的奇数数列 ls 1..5 #表示1 2 3 4 5 #!/

tcp6 0 0::: 80 :::* LISTEN [[emailprotected] ~]# lsof-i: 80[[emailprotected] ~]# Ps-ef | grep nginx[[emailprotected] ~]# curl-i 10.201.106.134[[emailprotected] ~]# wget 10.201.106.134[[email protected] ~]# Curl-o/dev/null-s-w "%{http_code}" 10.201.106.134% total% Received% xferd Average speed Time Time Dload Upload Total spent left Speed100 3700 100 3700 0 0 695k 0--:--:----:--:----:--:--0curl-s silent Display [[emailprotected] ~]# nmap 10.201.106.1 34-p 80 | grep Open | Wc-l1[[emailprotect

The shell, known as a program that acts as an interface between the user and the Linux OS, allows the user to enter commands that need to be executed to the OS. There are a lot of shells here, just bash.　　0) Shell version of the experimentShow Shell version:/bin/bash--versio

Recent project requirements, need to write some shell script interaction, the pipeline is not enough time, expect can be very good to implement the interaction between the script, search for information, found that many articles on the Web are reproduced, I think this article is also good, so simple changes to take over and share with you ~1. Expect isSpawn: Add the shell commands you need to execute, such

Tags: Test index Change REDIRECT Example header GPO Queue statusThe first line of the shell script illustrates the path to the interpreter: #!/bin/bashRun the script two ways: Use the bash command to run the shell file, or grant the script file execution permissions, you can directly execute the fileWhen the shell star

1. Crontrab for Linux in the projectScheduled execution under Linux is mostly done using a custom plan in the crontab file, but it's not very complex, and it's basically remembered once and for all, and the key is to remember the/var/spool/cron directory. Here's a look at the specific usage: First Look at the/etc/crontab file: $ cat/etc/crontab Shell=/bin/bashPath=/sbin:/bin:/usr/sbin:/usr/binMailto=roothome=/ # Run-parts* * * * * Root run-parts/etc/

[This is my own study notes, welcome reprint, but please specify the source:http://blog.csdn.net/jesson20121020] Variables and substitution operations, one of the easiest mistakes to make when performing variable substitution in a script is to refer to the error, so it is necessary to look at the meaning and function of the various quotes represented.References:double quote ""Use double quotation marks to reference any character or string except the character $, ', \ \. As shown below:[Emai

Shell Tutorial Shell echo commandShell variablesWhen defining a variable, the variable name does not have a dollar sign (required for variables in the $,php language), such as:Your_name= "w3cschool.cc"Note that there can be no spaces between the variable name and the equals sign, which may be different from any programming language you are familiar with. At the same time, the name of the variable names must

Tags: Linux shell1. Why use a functionLook at the role of aliases first[[emailprotected] ~]# alias httpd=‘/etc/init.d/httpd‘[[emailprotected] ~]# httpd start正在启动 httpd： [确定]function is to call the program multiple times the same code part is defined as a copy and then a name for the code, all the other repeated calls this part of the code will only call this name, when the need to modify this part of the code, just modify a code in the function body to implement all the calls to modify.Advanta

Tags: linux operations computer network Dahne Red Hat Linux system operationShell ScriptScript: Can execute the file, after running can implement some function (command stack, non-interactive)Standardize the general composition of shell scripts#! Environmental Statement (Sha-bang)# comment TextExecutable code#！ /bin/bash #环境声明 that the script written by Bash is a

Tags:pre delete pstree single quotes position main rules commissioning function Pstree-p #显示进程编号 (tree) echo $$ basic structure of #显示当前shell进程编号 scripts: #! Shebang (indicates what shell is used to open a file, typically using bash) configuration_variables #定义变量FUNCTION_DEFINITIONS # define function Main_code #主要执行命令 Syntax error in detection script

Toggle command line: CTRL+ALT+F1-F6 Switch to graphical interface: CTRL+ALT+F7 Ls-list (dir under Win)White: Normal fileBlue: Catalog FileGreen: Executable fileTo perform the steps: Input ls In the relevant directory go to the command program (path, environment variable:/etc/environment),whereis+ command: Find the location of the command's executable file Shell-based basic class library B