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Tags: shell20.5 logical Judgments in shell scripts• format 1:if conditions; Then statement; FiExample: a=5If [$a-gt 3]; then echo OK; Fi[Email protected] shell]# sh If1.shok• format 2:if conditions; Then statement; else statement; FiExample: a=5If [$a-gt 3]; then echo OK; else Echo Nook; Fi[Email protected] shell]# sh If1.shok[[Email protected] shell]# sh if1.shnot ok[[email protected] shell]# sh-x if1.sh+ a=2+ ' [' 2-gt 3 '] ' + echo not oknot OK• Fo

completed and they can exit. Some people may think that this is not simple. We just need to wait for the teacher to wait for all the students to finish, just like a thread ?! This answer is not correct either. Yes, the teacher's thread is indeed waiting for the student thread to end. What's wrong is that the teacher thread is waiting and still providing services. It's not as easy as reading the book after all the students stop writing. In Jvm, there is a thread GC that all developers are famili

', 'a buyer', 10, 30, 300GO/*Result setServer: message 50000, level 16, status 1, process T_INSERT _ cigarette sales table, row 29Error! The cigarette inventory is smaller than or equal to 0 and cannot be sold.*/-- Query dataSELECT * FROM cigarette inventory tableSELECT * FROM cigarette sales tableGO/* Supplement:1. This example describes how to use

verification annotation attributes Annotation attributes Example Description Compare [Compare ("MyOtherProperty)] The two attributes must have the same value. This is useful when you are required to provide two identical values for a property. Range [Range (10, 20)] A numeric value (attribute type that implements IComparable). value Range: [Range (int. MinValue, 50)] RegularExpression [RegularE

languages. In case of confusion, you can use curly brackets to distinguish them. For example: Echo "Hi, $" "Hi, hello worlds" is not output, but "Hi," is output ,". This is because Shell treats $ as a variable, while $ as is not assigned a value, and its value is null. The correct method is: Echo "Hi, $ {a} s" Variables in single quotes are not replaced.Introduction to Linux Shell programming (2) You also need to know several Linux commands related to the variables. Env is used to display the v

#！ /bin/bash#Cat d| D) Show disk usagesm| M) Show memory usagess| S) Show swap usages*) quitEofRead-p "Your Choice:" Choicewhile [$CHOICE! = ' quit '];d oCase $CHOICE ind| Decho "Disk usage:"DF-PH;;m| Mecho "Memory usage:"Free-m |grep "Mem";;s| Secho "Swap usage:"Free-m |grep "Swap";;*)echo "Unknown ..."Exit 9;;EsacRead-p "Again, Yourchoice:" CHOICEDoneRaid:Level: only means the disk organization is different, there is no subordinate points0: StripPerformance improvement: Read/writeRedundancy ca

10 most popular Java problems on Stackoverflow (1) 1. Why do we get a strange result when we subtract the time of the two October 1927 s? 3623 likes) If the following program is executed, the program parses and compares two date strings separated by 1 second: publicstaticvoidmain(String[]args)throwsParseExceptio

the management books written by Americans. Long, 550 pages. I am not familiar with the characters in the book except Buffett. Only a few people in the company have heard of it. There are many people and companies in the book, and they are dazzled. The overall rating is 4 stars, which is very good. The following is an excerpt from some of the content in the book. [] is the information I added based on the context:

10 tips for developers to quickly improve their Git level (1) Recently we have released two Tutorials: getting familiar with the basic features of Git and letting you use Git skillfully in the development team. The commands we have discussed are enough for a developer to use Git. In this article, we try to find out how to effectively manage your time and fully use the features provided by Git. Note: In thi

1. Create a script block 1: 2. Hide scriptsCode 1: Related code will not be executed in browsers that do not support JavaScript. 3 display when the browser does not support 1: 2: Hello to the non-JavaScript browser. 3: 4. Link an external script file

#01! What are the numbers of daffodils? #02!There are four numbers. The sum of any three numbers is 99,110, and the sum is, respectively. How can we find these four numbers? #03!Zhao's age has the following characteristics:1. The power 3 is a four-digit, and the power 4 is a six-digit;2. These four-digit and six-digit numbers are exactly the 10 digits from

In practice, you sometimes need to import a large amount of data into the database and then use it for various program calculations. In this experiment, we will use step 5 to complete this process and record the time spent by various methods in detail. The tools used in this experiment are VS2008, SQL server 2000, and SQL server 2008. 1 million pieces of data are imported into SQL 2000 and SQL 2008 respectively using the 5 method. The experiment envir

1. Create a script block 1: 2. Hide the script code 1: Related code will not be executed in browsers that do not support JavaScript.3 display when the browser does not support1: 2: Hello to the non-JavaScript browser.3: 4. Link an external script file 1: 5. Comment the scrip

Today, we share a list of PHP cases, we learn together. use the shuffle function to generate a random number. 1 2 3 4 5 6 7 8 $arr =range (1,10);Shuffle ($arr);foreach ($arr as $values){echo $values. " ";}?> Use the Array_unique function to generate a random number. 123456789 $arr =array ();while (count ($ar

Vi and vim Editor (10): advanced editing method (1) Custom vi: There are many options that can be set in the vi Editor, which will affect the operations of the vi editor. You can use the ex command ": set" to change the options in vi. In addition, as long as the vi is opened, the ". exrc" file located in your main directory will be read to get the relevant settings of vi. Use the ": set" command in this fil