Shell

Because the individual station can not guarantee higher availability, there may be data easy problems, so it is necessary to achieve backup database needs, so I found some information on the Internet, combined with my actual situation, through the

#!/bin/bashecho "Please input number:" Read na= ' expr $n/100 ' #a1 = ' expr $n-$a * b= ' echo ' ($n-$a *100)/10 "| BC ' c= ' echo ' ($n-$a *100-$b *10) "| BC '  d= ' echo ' $c *100+ $b *10+ $a "| BC ' echo $d turn:

Today, to use the shell to do some auxiliary work, long time not to use, a little forgotten ...Here's a summary of today:1. If the brackets of the If judgment to leave enough spacesuch as if space [space content space];then........Fi2. The condition

The test command usage. Function: Check file and compare value 1) Judge the expression if test (expression is true) if test! expression is false test expression 1–a expression 22 expression is true test expression 1–o expression 22 expression has a

Functions are the essence of the shell, and with functions and libraries, the shell handles complex problems as well as the compiler language, gravitated the importance of shell functions and libraries.1 Definition of functionRecommended UseHow to

The variables of 0.shell are different from the environment variables, and the user environment area exists. Variables are assigned in the following way: Variable_name = variable_valuea= "Hello" $a the value of a on the variable, and several Linux

Reprint Please specify source: http://blog.csdn.net/l1028386804/article/details/46463503HBASE ShellEnter HABSE database terminal: # $HBASE _home/bin/hbase ShellCreate a table>create ' users ', ' user_id ', ' address ', ' info 'Table users, there are

Shell Script (iv)(7) TR command#实现字符转换功能#-c string: Inverse string character set, that is, all character sets except for the string#-d string: Delete all occurrences of characters in string#-s: Deletes all occurrences of a sequence of characters,

After the password expires, change the password to the original password, the server a lot of work, write scripts to complete.After logging in, modify the prompt to: doraemon# convenient expect matchModify Lang=c, prompt for English to prevent

Introduction to the sceneUse Cygwin under Windows, use Apktool to repackage apk; Way OneCD D:CD path/to/apk/in/dApktool D name.apk Way TwoDrag the file into the Cygwin window to delete the trailing file nameCTRL + ACD SPACEApktool D name.apk Mode

The automated DHCP service shell script is as follows:#vim auto_dhcp.sh#!/bin/bashread -p  "please input your ip: "  IP       #设置dhcp服务器ipread  -p  "please input your gw: "  GW       #设置dhcp服务器网关IPNET =$ (echo  $IP  |awk -F.  ' {print $1 '. " $ "." $

1.7 arrays and associative arrays An array is a very important part of Shell scripting, and it uses indexes to store multiple independent independent data as a collection. An ordinary array can use integers only as an array index, and

Learning cycle, see a lot of for,while, or until, and select with less, here is a little summary of the next select this cycle.Basic structure:Select VALUE in LISTDoCOMMANDDoneAnd the reality out of the structure is probably a number before the

Case Flow control:Case structures are used for condition judgments in a variety of situations. Similar to switch/case statements in other programming languages, but it is very different from the grammatical form.Case string inModeStatement;;Mode 2 |

HBase provides a shell terminal to interact with the user. Use the command Hbaseshell to enter the command interface. You can see the Help information for the command by performing a helper. Demonstrate the use of hbase with an example of an online

#!/bin/sh#count memory_used_rate,disk_used_rate # @yuanwb  2015-5  #disk_used_rate #depend  on real storage place the parameter  ' Location '  need to  Alter. location=/dev/sda1disk_used_rate1=$ (df -h | grep  $Location  | awk  ' {print $5} ') free1=

[email protected] mc]# cat mc.sh#!/bin/bashfunction Random {mc0= "192.168.8.62 7510"#MC1 = "192.168.30.22 7510"Case "$ (expr $ (date +%s%n) \% 2)" in0)Mc= "$MC 0";;1)mc= "$MC 1";;Esac}> Set-result.txt> Get-result.txt> Delete-result.txtFor ((i=0;iDoa=

1.2 Terminal printing A terminal is an interactive tool that allows users to interact with the shell environment. Printing text in a terminal is a basic task that most shell scripts and tools need to perform daily. Through the terminal

A variable definition1 explicitly defined variable=xxx no spaces2 Read variable ReadingThe following two lines of code are written, reading name and namefamilyRead-p "Please input your name:" NameRead-p "Please input your whole name:" Name familyRun

Shell-based variablesVariable typeShell variables include environment variables, location variables, pre-defined variables, and custom variables.Environment VariableShell environment variables are a type of Shell predefined variables used to set the