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1. Nature Special Distributed Database , mainly used for storing information, any information can be read and written in the block chain. 2. Features The block chain has no administrator and is not centralized, and its design goal is to prevent the emergence of a central authority. 3. Block Block chain consists of blo

untrustworthy, so the 2/3+1 must be returned. Phil himself figured it out. [1] Author: Li Qire Link: https://www.jianshu.com/p/fb5edf031afd Source: Jianshu Copyright belongs to the author. Commercial reprint please contact the author to obtain authorization, non-commercial reprint please indicate the source. [0] Ask technology Daniel, PBFT is not the best consensus mechanism in the block chain at

Display: inline; inline elements are displayed in the same line.Display: block; block-level elements. In short, there is a line break that will be switched to the second line.Display: inline-block, which is a block-level element in the same row.The concept is too vague. Let's use a real case.A is a row by default, so i

#include C++12 a tall and different person, lined up in two rows, each row must be from short to high, and the second parallelism corresponds to the first row of people high, ask how many kinds of arrangement?

Law one: The logarithm of a number, +1 rounding is its number of digitsProblem converted to int (log10 (n!) +1), logarithmic property log10 (n!) =LOG10 (N) +log10 (N-1) +...+log10 (1)/* Use LOG10 to find the number of digits */#include When n is large, time is long, TLELaw II: Stirling formulaLog (n!) = log10 (sqrt (2*pi*n)) + N*LOG10 (n/e);/* Use Stirling to find the number of positions */#include WA two times reason:Num_digit=log10 (sqrt (2*pi*n)) + n*log10 (n/e) +1; printf ("%d\n", (in

Learn from the old boy Linux operation and maintenance of a book will be published, to seek the advice and choice of everyone!The students of the publishing house are very hard, and now the publishing house has designed us with the old boy to learn the cover of Linux operation and Maintenance bookTwo cover, everyone think which good on the review, must be two choose one ah!Choose which, say the reason of choice, thank you all! add the two QQ Exchange Group 226199808 and 339128815

divided into several chunk memory blocks (chunks in different slab are not the same size)Memcached maintains a memory allocation information table, which writes data to the slab partition central area that has the most chunk size and data size, which can reduce memory wasteTip: Similar to disk Inode,block7, memcached deletion principle and delete mechanism?　　Memcached is an inert detection mechanism, does not actively detect whether the data is out of date, only when the data is get to detect w

} Delete the substring of the shortest match $substring from the end of the variable $string ${string%%substring} Delete the substring of the longest matching $substring from the end of the variable $string ${string/substring/replacement} Use $replacement to replace the first matching $substring ${string//substring/replacement} Use $replacement instead of all matching $substring ${string/#substring/r

1) Why is it called a shell?From the user's point of view, the user is not able to directly manipulate the kernel, but through the kernel "shell" program, known as the shell, to communicate with kernel.1 different operating systems use different kernel,2 and on the same kernel, you can use a different shell.Most of the Linux system's default shell is bash, the reason is as follows two points:1 Free Software2 Powerful features2) What is the relationship between Shell prompt (PS1) and carriage Ret

the L AST Line(6) Inserting multiple lines[[email protected] ~]# NL file.txt | Sed "2afirst\nsecond" file.txt wtmp begins Mon Feb 14:26:08 2014192.168.0.1firstsecond162.12.0.123this(7) match the data and do the operationJust add a regular match on the basis aboveSed "/matching mode/method of processing" file.txtSed "/^root/d" file.txt to start with root deleteFor exampleMatch begin, and delete a row[[email protected] ~]# NL file.txt | Sed "/begin/d" 2 192.168.0.1 3 162.12.0.123 4

Read the CU forum Shell 13 After a few small experiments, prepare to forget!Shell 13 Q Address: http://bbs.chinaunix.net/thread-218853-1-1.html#!/bin/bashfunction func_com () {Local a=1 local b= "2c3" Echo ${a}b echo $ab}function Func_arra Y () {echo "##### func_array #####" local path= "/home/stone" source $PATH/include/tt.ini #echo $name Local srand= (1 3 5 2) Local srand_num=${#srand [*]} for ((i=0;iLinux Shell QuickStart Small example (Shell 13 ask