egrep syntax

The most likely cause of this problem is:Files written under Windows are uploaded to Linux execution.I wrote the code on notepad++, and then uploaded it to Linux to execute it and report this error. Careful examination, there is no grammatical error. Surfing the Internet, found that Windows and Linux are different lines of the cause of the change.Windows is carriage return + line Crlf;linux is just a line break LFCr means carriage return, enter, \R,ASCII code of 13LF means linefeed, newline, \n,

Common Markdown syntax and markdown syntax 1. Title The title is the most common format in each article. In Markdown, if you define a text as a title, you only need to add"#"You can. As shown in. There are 6 levels of titles in total. We recommend that you add a space character after. 2. List class Add "-" or "*" before the text to changeUnordered list; Add "1.", "2."... and other digital symbols

Python Syntax: python-Bubble sorting and python syntax After that, I said that I needed to collect data on the beauty human body art station. I used python to collect and learn python syntax knowledge. Now I want to share the python Bubble Sorting statements. Bubble Sort is a simple sorting algorithm. It repeatedly traverses the series to be sorted, compares two

It was originally implemented in c ++. recently, the company needs to develop a php web site program using php + mysql + jQuery + css. Now I need to implement a function to display recommendations for articles similar to the title of this article at the end of an article, with links attached. I am wondering if it is caused by a syntax problem. please help me check it out. thank you for the following code: quot; associate the basic php

You can modify it via vim in Cygwin, or you can modify home\Ndkroot=/cygdrive/e/andriod/develop/android-ndk-r8Export NdkrootWhich ndk=/cygdrive/Restart Cygwin, enter:CD $NDKYou can enter the NDK corresponding directory description settings OK.Error occurs at this time-bash: $ ' \ R ': Command not found-bash: $ ' \ R ': Command not found-bash: $ ' \ R ': Command not found-bash: $ ' \ R ': Command not found-bash: $ ' \ R ': Command not found-bash: $ ' \ R ': Command not found-bash: $ ' \ R ': Comm

Python basic syntax _ function _ return value and python basic syntax Python basic syntax Summary: The return value of a function is an important part of a function. The root of a function is to implement some functions of the program. Therefore, we often need to return the result after the function is executed to the program for further operations. It can be sai

JSP basic syntax and JSP basic syntaxBasic JSP Syntax 1. JAVA code 2 on the JSP page, instructions 3 on the JSP page, and implicit objects on the JSP page (nine built-in objects)Directory 1. JAVA code on the JSP page JSP expressions (convenient output) JSP script (complete relatively long logic operations) JSP Declaration (add attributes or methods) 1. JSP expression (Format: 1 Note: you do not nee

[Good programmer notes sharing]-ios development gold syntax, programmer ios gold syntax IOS training ------ my C Language notes. I look forward to communicating with you! In May last November, I decided to buy three books online after iOS development: iOS7 Quick Start, iOS Development Guide-from scratch to App installation, and Swift development guide. After reading these three books, I still learned

Quick Start (1)-basic syntax and basic syntax I recently started to learn swift and organized the learning process and summary into a series to facilitate future review and summarization.Basic syntax No extra points are required for each row in swift. Separate multiple statements in the same row// Indicates the comment, or use /*...... */Constant A constant is t

First understanding of PHP (1) basic syntax, first understanding of php basic syntax I have been preparing to learn PHP, but there was always a problem some time ago, which was delayed for a while. Catch up now! This series only talks about some of my views on PHP, not the nature of the tutorial. In addition, I am a little white, just write casually, please pat. I have studied c, java, python, and HTML. If

NodeJs basic syntax and type, nodejs basic syntax Preface Today, I want to check the knowledge about Node types. I want to summarize it and see an article on Googol, but the original link is gone. I will pull this article out of the snapshot, if the original author has a problem, contact me! This article is the basis of some JS, and experts will skip it automatically! I have never written JavaScript before.

Common jstl syntax in jsp (2) and jspjstl syntax Syntax format Attribute Attribute Description Required Default Value Test Condition Yes None Here is an example:

CSS basics: basic and syntax, css basic syntax ** CSS syntax ** CSS Rules consist of two main parts: Selector and one or more declarations. A selector is usually an HTML element that you need to change the style.'''Selector {declaration1; declaration2;... declarationN}'''Each declaration consists of an attribute and a value.Property is a style attribute ). Each a

TAGS: LSE multi-debit value done condition test execution Sele AC lineMainly introduces the syntax of Shell Basic statementIf statement syntax1 single branch structure (if, then)If Or as follows:If ? Then? InstructionsFi2 Dual-branch structure (if, then, otherwise ...) )If ? Then? InstructionsElse? InstructionsFiMulti-branched structure (if, then, otherwise if, then, otherwise ...) )If ? Then? Instructionselif ? Then? InstructionsElse? InstructionsFiW

Label:MongoDB Grammar MySQL syntax Db.test.find ({' name ': ' Foobar '}) Db.test.find () Db.test.find ({' ID ': ten}). Count () Db.test.find (). Skip () Limit Db.test.find ({' ID ': {$in: [25,35,45]}} Db.test.find (). Sort ({' ID ': -1}) Db.test.distinct (' name ', {' ID ': {$lt:}}) Db.test.group ({key:{' name ': ' true},cond:{' name ': ' foo '},reduce:function (obj,prev) {prev.msum+=obj.marks;},initial: {msum:0}}) Db.test.find (' this.id D

Decompression Jquery-syntax-3.1.1.zip, will be public in our own directory, in the Web page to introduce the following 3 JS (download address is http://download.csdn.net/detail/liumengcheng/7344667) Copy Code code as follows: HTML section: Copy Code code as follows: JS section: Copy code code as follows: The default type of configuration file is XML var filetype= "xml"; Whe

(C syntax) Minimum Public multiple, c syntax 24 minimum public multiple Knowledge point: Algorithm While loop usage. Content: returns the minimum public multiple of two natural numbers. Input description: Output description: Input example: 2 4 Output example: 4 1 # include The minimum public multiples of A, B, and C are 24, the minimum public multiples of B and C are 40, and the minimum