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[4]} Blue [[emailprotected] ~]# echo ${#color [4]} 4 [[emailprotected] ~]# color= (' Red ' green ' [4]= ') Bluesadfasdf ') [[emailprotected] ~]# echo ${#color [4]} Bash pseudo-random number generator: $RANDOM Exercise: randomly arbitrary bits from all the students; Exercise: Generate N random numbers (n>5) from a script and sort them from small to large; #/bin/bash Declare i Num=0 Echo-e "The or
command-line mode: For I in {1..10};d o echo $i;d one =========================================== while loop statement usage while condition to meet cond Ition executes the cmd do-cmd-done bash-x to run the script in debug mode to display the script's running process until loop statement usage: Until condition--G t; does not satisfy the condition, then executes the cmd do cmd-done case multi-conditional Judgment Statement usage: Case value in va
An array is a data structure that can be used to design algorithms more efficiently and easily for bash programming, which is described in detail in this chapter in the sections on arrays and strings.Array array definitionAn array is a contiguous memory space that stores multiple similar elements, and a variable is a memory space that stores a single element, compared to a variable.Declaration arrayDeclare-
Scripting for the special use of the while statement under the Linux Bash Program (10)1. Loop control:Break: Interrupts the entire loop statement, which is the statement following the execution of the script after exiting the loopContinue: Interrupt the current cycle, advance to the next round cycleExit: End Script Run2.while dead Loop, that is, when you do not know how many times the loopFormat: while:; DoLooping statementsDone3.while reads and assig
Gefa1aadtcfarw-k936.jpg "/>Method two: By using grep to determine whether the user's input contains non-numeric, if not included, then output 0, if included, Output 1.650) this.width=650; "style=" Float:none; "title=" if3. JPG "alt=" wkiom1cd41-xavmyaadwcjzwsls453.jpg "src=" http://s3.51cto.com/wyfs02/M02/7E/8D/ Wkiom1cd41-xavmyaadwcjzwsls453.jpg "/>Validation results: The script names of the two methods are if2.sh,if3.sh650) this.width=650; "style=" Float:none; "title=" Ifresult. JPG "alt=" wk
Scripting for Bash programming until statements and formatted hard disk partitions in Linux (10)1. Summary of circular statement structure1.1.while Statement Enter the Loop statement when the condition is metWhile condition; DoStatementDone1.2.until Statement Enter the Loop statement when the condition is not satisfieduntil conditions; DoStatementDone1.3.for variable in list; DoLoop bodyDone1.4.for ((expres
Linux Bash programming case statements and scripting (eight)1.case statement in the following format:Case variable inValue 1)Statement 1...;; Each branch statement ends with a semicolonValue 2)Statement 2...;;*) Other, equivalent if statement elseStatement 3...;;ESAC the entire case statement ends2 . Write a script that adds and deletes the user arbitrarily, with the following requirements:2.1: If the scrip
:${array_name[index]}Note: If you do not give a specific index number when referencing an array element, the default number is 0, which displays the value of the first array element;Refer to all elements in the entire array:${array_name[*]} or ${array_name[@]}Index number of all elements referencing the entire array:${! Array_name[*]} or ${! Array_name[@]}To view the number of elements in an array (array length):${#ARRAY_NAME [*]} or ${#ARRAY_NAME [@]}Whole Group of slices:${#ARRAY_NAME [*]:offs
Old boy new book Shell programming Real-time scheduled to start (scan the QR code to purchase the regular package of mail), dear friends, keep you waiting. Computer User Poke Computer Purchase linksNote: Package parcel post 3 months (after 2017 Chinese New Year) Q Group book content answer questions, is equal to white send bo
Starting today to learn shell programming, when the university learned c,c++, compilation, but long forgotten, I think the algorithm is done, what language is just a tool. Learning here, the class of students, especially a little did not touch the programmer, really very difficult, and the teacher here also out of some tidbits ...Originally taught our teacher cold, the voice is dumb, so let's teach our project teacher to substitute, is also a female t
Tags: array rar organization Throw exception build log job schedule exec expressionThis week's book is the Ultimate guide to Oracle's C PL (SQL) programming, published by the mechanical industry press, Sun Fingdong, Wang Yu, Guo Xiaohui. Content Introduction: The ultimate guide to Oracle 12c PL/SQL is the most systematic, comprehensive, practical and authoritative
Today, our first book, based on XCode6.1 's latest version of Swift Grammar, has a lovely name: "The old code says programming to the Swift River," and a beautiful cover:This book is not a pedigree, it's just a five-bit it old yard kid.One day in May, we have a few old yards to the software park at the door of the small noodle restaurant to eat, chat suddenly on
Reads a row from the standard input and sends the value of each field in the input row to the specified shell variable.If more than one data is entered, the first data is given to the first variable, the second one to the second variable, and if the number of variables is entered, the remaining data is given to the last variableWhat if the number of arguments you enter is more than the number of parameters that are preset on the command line?In this example,-P is for the read command to output a
The recommended star rating for this book is: 5 stars. After all, it is a classic book, Nothing to say.As far as the Assembly itself is concerned, the preparation of high-efficiency programs and the optimization, commissioning, and reverse engineering of the project is a foundation; in terms of the theoretical operating system, the assembly lets you understand the CPU, understand the architecture of the com
. The idea, along with some other advantages, is the growing cause of functional programming on the server side.CliAlthough the Web and node. JS are two main JavaScript environments, some pragmatic and enterprising users are looking for ways to use JavaScript for command lines. Using JavaScript as a command-line interface (CLI) scripting language is a great opportunity to apply functional programming. Imagi
improve the efficiency of learning and use. The book according to the level of QT knowledge structure and the reader's Learning Law step-by-step, to explain. For each knowledge point in the book to explain, all strive to make readers not only "know", and "know Why". Only in this way can we really let the reader grasp the essence of knowledge and thus improve the ability of engineering practice. Finally, f
basic information of this bookShanyun (authored)Publisher: People's post and telecommunications publishing housePublication date: 2012-6-1isbn:9787115280640Edition: 1Number of pages: 265Number of words: 406000Printing time: 2012-6-1Folio: 16 OpenPaper: uncoatedImpressions: 1Package: PlainPrice: 39.00 RMBbook coverContent Introduction"C + + Hacker programming Disclosure and prevention" is designed through simple grammar knowledge and common system func
is not a lot of people tell you, learn Python development should honestly find books to see, and then with the Doom knocking code? The computer has, the software also has, the heart also received back? All you have to do is just owe books? Didn't find the right book? Can look at these.1.Basic Python Tutorial (2nd edition revision)650) this.width=650; "Src=" http://5b0988e595225.cdn.sohucs.com/images/20170830/ E30272cbb0f74e2394741f8b987c4cb8.png "alt=
Original address: Lax Language TutorialsAndrew BinstockEvery year in the review of Jolt Awards books, I will be a number of language tutorial books are exhausted. Judging from these years of experience, these language tutorials are well written, but in addition, there are few bright spots. In other words, these books are very rigorous, very sophisticated, if the reader has sufficient strength, through their mastery of a language programming technology
Copyright statement: original works can be reproduced. During reprinting, you must mark the original publication, author information, and this statement in hyperlink form. Otherwise, legal liability will be held. Http://blog.csdn.net/mayongzhan-ma yongzhan, myz, mayongzhan Address: http://codepoets.co.uk/book-review-object-orientated-programming-php5-hasin-hayder-packt-publishing Suddenly I received an emai
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