Shell

Want to see the Linux traffic situation in real time, and do not want to go to the third-party tools, you can directly write footsteps run!System: CentOS 6.5Principle: Obtain the flow from the/proc/net/dev, and then by the conversion and divided by

Login shell (requires a password) To log in normally through a terminal, you need to enter a user name and password.Using Su-usernameUsing su-l username Non-login shell (no password required) SU usernameOpen terminal window under

#!/bin/bash#auto Install LAMP#by Csy 2015-11-07#Httpd Define PATH

0. Internal variables in the shell:1. $?: Represents the return value of the shell command.2. $$: Represents the PID of the current shell.3. $!: The last PID value to be put into the background job.4. $ A: Indicates the name of the script.5. $1--$9,$

The test command in the shell is used to check if a condition is true, and it can be tested in three aspects of numeric, character, and file. Numerical test Parameters Description -eq Equals is True

1. IntroductionHBase is a distributed, column-oriented, open-source database derived from a Google paper, BigTable: A distributed storage system of structured data. HBase is an open source implementation of Google BigTable, which leverages Hadoop

Shell Foundation-environment variable configuration fileSource configuration file or. Configuration file:After the environment variable is written to the configuration file, the user needs to re-login to take effect, but with the source command, it

One: Linux shell string interception and splicingSuppose there is a variable var=http://www.linuxidc.com/123.htm 1 # Intercept, delete the left character, and leave the right character.  Echo ${var#*//}where Var is the variable name and the # is an

1. First, log on to the remote Linux server, such as 192.168.127.222, with the normal password login method;2. Click the Key Generation Wizard in the tool:650) this.width=650; "src=" http://s3.51cto.com/wyfs02/M00/74/67/wKioL1YcmyPy22e-AAI3RPggo2A573

FunctionFunctions have the same functionality:Simply put, the function of the program is to call the same part of the code in a number of parts, and then a name, so the function is called the name can be, in the modification of the code, only need

1 Descriptionthis Shell script is the first generation of my written version of the Delta Code on-line script, now the code-on-line script has been updated several versions, focus on the technical focus is to visualize the code version of any

1 , describes the operation principle of shell program (can be attached with necessary graphical description);What is a shell?The shell acts as the shell of the operating system, providing the user with an interface to use the operating system. It

First, use '. ' Perform1. Contents of the file:a.sh#!/bin/sha=2echo a= $ab.sh#!/bin/sh./a.shecho a.sh:a= $a2. Add executable permissions# chmod +x a.sh b.sh3. Running#./b.sh a=2a.sh:a=It can be seen that a in b.sh does not get the A variable in a.sh,

/path/to/scriptname opt1 opt2 opt3 opt4 $0 $1 $2 $3 $4Is that clear enough for you? Run the script file named "$" variable, the first parameter is $ ~ ~ So, as long as we use in script, we can easily release some

Here are some of the shell's commonly used shortcut keys, shortcut keys to play familiar with to a certain extent, can improve productivity drops ... + a switch to command line start + e switch to command line end + L Clear Screen

Here's what you'll find useful after reading the third chapter of the Linux command line and Shell script programming encyclopedia.1./ETC/PASSWD file　　This file contains a list of all system user accounts and basic configuration information for each

Recently learned SCP automatically entered the password.#!/bin/bashSet-xTime= ' Date +%y%m%d%h%m%s 'Source= '/home/cqq/project 'Passwd= ' 123 'Tar zcvf ${time}.tar.gz $SOURCE >>/dev/null 2>&1Expect-c "Spawn scp-r [Email

Ftp-v-d-i-n-g [host name], where-V Displays all the response information for the remote server;-N Limit FTP automatic login, that is, do not use;. n etrc file;-d use debug mode;-G cancels the global file name.http://blog.itpub.net/20943428/viewspace-

最近在windows上编辑一些shell脚本后上传到交换机框体上后，这些shell脚本无法执行，每一行结尾都有‘^M‘，同时框体上又没有dos2unix工具，这么多脚本也不可能一行一行来修改，于是就自己写了一个脚本来把当前目录下所有文件中的‘^M‘去掉。#!/bin/shFilename=' ls ' forFinch ${filename}; Do if[- F ${f}]; Then Echo "Delete ' ^m ' and rename file to ${f}1

Environment variable configuration file for Shell programming, I. Introduction1. Variable type:User-Defined variables (local variables)Environment variables: Define the operation environment for each user. The learned paths and ps1 are used. To