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Fun Bash Script: test statement

test commands can be replaced with square brackets. For example Test-f hello. cCan be changed [-F hello. c]It's very convenient. Note that there is a square brackets and an expression before and after each SpaceInterval. Do not discard it. Actually [space-f hello. c space] Other notes are the logical expressions in square brackets, such Test $ a-lt $ B-a $ a-gt $ cCan be converted [$ A-lt $ B-a $ a-lt $ c]

Fun Bash Script: test statement, bashtest

earlier. Haha. In fact, all the above test commands can be replaced with square brackets. For example Test-f hello. cCan be changed [-F hello. c]It's very convenient. Note that there is a square brackets and an expression before and after each SpaceInterval. Do not discard it. Actually [space-f hello. c space] Other notes are the logical expressions in square brackets, such Test $ a-lt $ B-a $ a-gt $ cCan

Redundant code goes away--front-end Module packaging tool Rollup.js Getting Started

functionality through configuration files.We create a new rollup.config.js in the project root directory:default { ' src/main.js ', ' CJs ', // output file };And then executeRollup-cCan be packaged using the information set by the default configuration file (rollup.config.js) .If your profile has a different name (for example, "Rollup.config.dev.js"), add the following configuration file name:Rollup-c Rollup.config.dev.jsRollup also supports the

Go language Learning Notes---concurrency

goroutine reads some elements from the channel, freeing up space. Example: Package Main Import "FMT" Func Main () {c: = make (chan int, 2)//modify 2 to 1 for error, modify 2 to 3 to operate normally C Range and close package mainimport "fmt"func fibonacci(n int, c chan int) { x, y := 1, 1 for i := 0; i Output results: 11235813213455 for i := range cCan continuously read the data inside the channel until the channel is explicitly closed. T

6. Xen Virtual machine cracked password

to crack the Xen password, the beginner Xen was not very good at the time, always think of the Xen character interface, not as the GUI menu appears. Xen Virtualization Platform XM one command parameter- Ccan solve this problem, can appear the character Interface Grub menu,This article only introduces a simple way to achieve, that is, in this way to achieve a single user mode startup, change the password.1. If you forget the root password one day2. Tur

Gulp of the front-end building artifact

)? + +(pattern|pattern): Matches any pattern given in parentheses at least 1 times, similar to the JS regular expression(pattern|pattern)+ + *(pattern|pattern): Match any pattern given in parentheses 0 or more times, similar to the JS regular expression (pattern|pattern) * + @(pattern|pattern): Matches any given pattern in parentheses 1 times, similar to the JS regular expression(pattern|pattern) File matching chestnuts are as follows:+* Can matcha.js、b/、c,But it doesn't match.a/b.js+

Fast Power modulus (2015.7.29)

The remainder has a%, i.e.Ten%3Can get 1But when the numbers are large (for example, 2999999), the computer may not be able to calculateHowever, based on the conclusion of number theory, we can simplify it.According to a*b mod C = ((a mod c) * (b mod c)) mod CCan draw an mod b = (a mod b) n mod bSo, there's an mod b = (a mod b) n mod b = (a mod b) n/22 mod b = (AN/2 mod b) 2 mod b = (AN/2 mod b) 2 mod bIf you use Exp_mod (a,n,b) to represent an MoD B

13-->>python3

The Roman numerals contain the following seven characters:,,,, I V X L C , D and M .Character value I 1V 5X 10L 50C 100D 500M 1000For example, the Roman numeral 2 is written II , that is, two parallel 1. 12 Write XII , that is X + II . 27 Write XXVII , that is XX + V + II .Usually, the number of Roman numerals is small and the numbers are on the right side of the large numbers. But there are exceptions,

JavaScript and objective-c Communication in UIWebView

// 调用js 对象的方法NSString *result2 = [webView stringByEvaluatingJavaScriptFromString: @"window.objectApis.doSomething(‘hello \" world‘)"];JavaScript-Objective-cURLRequest InterceptIn UIWebView the browser JavaScript , there is no related method that can be called by the associated interface Objective-C . It is generally used JavaScript in the browser environment to make a request to URL Objective-C intercept the request to get the idea of the request. Intercepts th

Linux sed usage

line of the current)~C: Replace,Ccan be followed by a string that can replacen1,n2between the lines! D: Delete, because it is deleted Ah, soDThe back usually does not pick up any boom;I: Insert,Ican be followed by strings that appear on a new line(Current Previous line);P: Print, that is, print out a selected material. UsuallyPwill be associated with the parameterSed-nWorking together ~S: Replace, can be directly replaced by work! Usually thissthe ac

Leetcode [13] (Java): Roman to Integer

title : Roman Numeral conversionproblem difficulty : Easytitle Content : Roman numerals is represented by seven different symbols:,,,,, and I V X L C D .Symbol valuei 1V 5X 10L 50C 100D 500M 1000For example, the written as in II Roman numeral, and the just, the added together. Twelve is written as, XII and which is simply X + II . The number twenty seven XXVII is written as and which is XX + V + II .Rom

"Linux Discovery Tour" Part IV lesson Three: file transfer, dashing sync

, read, download files How to copy files securely The knowledge of the Web, which is covered in this article, can be consulted on the series of tutorials that have been completed: Http://blog.csdn.net/column/details/webexplore.html? wget: Download fileLet's start with a simple command. is: wgetIt allows us to download files directly from the terminal console, simply by giving the HTTP or FTP address of the file.Command format:wget [references] [URL address]Like what:wget Http://cd

"C-Language concept"

What does a C program consist of?FunctionWhat is the source file extension for C programs?. C OR. CCan the source file of C program run directly? Why?cannot be run directly. Because the computer can only recognize 0 and 1, the source file contains a lot of C language code, the computer is impossible to readWhat steps does the C program require from development to operation?1> writing. C Source Files2> compile. C source file for. O Destination file3> l

Evolution of large-scale website system architecture (i)

spring, and they also modularize different functions, and there are many drawbacks to this form:1 with the passage of time, the various modules are constantly updated, the version has been upgraded, if module a depends on the module b,cCan be understood as a is the Web front module, b is the user module, C is the order moduleSuch as:If B or C changes, then A has 2 options:1 Do not update B and C, can still be used, bring the consequences will be not

An online markdown editor that supports real-time preview-markdoc

Recently, documents need to be written for some projects and systems in the group and published on the company's document platform. This platform does not support markdown. Therefore, we plan to create an online markdown editor that supports real-time preview, in addition, it is easy to migrate to the company documentation platform, so this markdoc is available. Link: http://weareoutman.github.io/markdoc/ : Use Write on the leftMarkdown Real-time preview on the right Scroll join on bo

Leetcode: Roman numerals to integers "13"

40 and 90. CCan be placed on D M the left side of (500) and (1000) to represent 400 and 900. Given a Roman number, convert it to an integer. The input is guaranteed to be within the range of 1 to 3999.Example 1:Input: "III" output: 3Example 2:Input: "IV" output: 4Example 3:Input: "IX" output: 9Example 4:Input: "LVIII" output: 58 Explanation: L = 3, v= 5, Iii.Example 5:Input: "MCMXCIV" output: 1994 Explanation: M = +, CM = =, XC = all, IV = 4

Roman to Integer

Roman numerals is represented by seven different symbols:,,,, I V , and X L C D M .Symbol valuei 1V 5X 10L 50C 100D 500M 1000For example, the written as in II Roman numeral, and the just, the added together. Twelve is written as, XII and which is simply X + II . The number twenty seven XXVII is written as and which is XX + V + II .Roman numerals is usually written largest to smallest from left to right. How

# Leetcode #13. Roman to integer

Https://leetcode.com/problems/roman-to-integer/description/ Roman numerals are represented by seven different symbols:I,V,X,L,C,DAndM. Symbol ValueI 1V 5X 10L 50C 100D 500M 1000 For example, two is writtenIIIn Roman numeral, just two one's added together. Twelve is written,XII, Which is simplyX+II. The number twenty seven is writtenXXVII, Which isXX+V+II. Roman numerals are usually written largest to small

Leetcode record-convert the number of Rome to an integer

The number contains the following seven characters:I,V,X,L,C,DAndM. Character value I 1 V 5x 10l 50C 100d 500 m 1000 For example, write the number 2 in RomeII, That is, two parallel 1. 12 writeXII, That isX+II. 27 writeXXVII, That isXX+V+II. Generally, a small number is on the right of a large number. But there are also special cases, for example, do not write 4IIII,IV. The number 1 is on the left of number 5, and the number is equal to the number 5. Reduce the number 1 to get the value 4. Simil

Catalog Start with

337. You has lost all your RMAN backup set pieces due to a disk failure. Unfortunately.Automated Cross-check script that also does a delete expired backupset command. You are restored allThe backup set pieces from tape. What command would your use to get those backup set piecesRegistered in the recovery catalog and the control file of the database again?A. Register DatabaseB. Recover CatalogC. Load BackupsetD. Synch metadataE. Catalog start withAnswer:eThe answer resolves:Reference: http://blog.

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