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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

course, EF4 still supports general database design, but Visual Studio can be used to design databases based on object models, which has been greatly improved. This document describes how to create an ADO. Net object data model through EF4. The tool used is Visual Studio 2010 beta 2, which may be different from the final release. Later articles will explain how to use EP4 to query and display data, call the stored procedure, and customize the classes generated by EF4. Create a database using

Java multi-thread Development Series 4: Playing with multiple threads (thread control 1), java multi-thread We have learned the basics of threads, how to create multithreading, And the thread lifecycle. With existing knowledge, we can write simple programs that use multithreading to process a large number of tasks. However, when the application scenario is complex, we also need to start with management cont

(cigarette brand, inventory quantity, inventory unit price, inventory amount)SELECT 'hongtashan neoligan', 1200, UNION ALLSELECT 'hongta mountain others', NULL UNION ALLSELECT 'Yunnan image', 500, UNION ALLSELECT 'yuxi ', 0, 30, 0GO-- Query dataSELECT * FROM cigarette inventory tableGO/*Result setRecordId cigarette brand inventory quantity stock unit price stock amount--------------------------------------------1 Hongt

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

C # It takes only 4 seconds to import 1 million pieces of data into the SQL Server database (with source code) 2010-10-13 from: cnblogs font size: [large, medium, small] Abstract: This article introduces four methods for importing millions of data into the SQL Server database in C # and compares their efficiency. sqlbulkcopy can efficiently import data, test code and data are provided for download. In

Java programming Chapter 1 and Chapter 4 programming exercises and java programming exercises 3.1 public class test { public static void main(String[] args) { System.out.println("Enter a, b, c: "); Scanner input = new Scanner(System.in); double a = input.nextDouble(); double b = input.nextDouble(); double c = input.nextDouble(); double delta = b * b -

Use RDLC Report (1)-(4) use RDLC Report (1) 1. Create a data source Start VS2005 to create a form project named TestProj Select "Add new data source" in the form on the left or click "Add new data source" on the menu ": Select the dialog form and select "Database" to go to "Next ": This data source uses the Northwin

necessarily. 3. Become the ancestor of the rich. Life is regarded as a hero, and death is also a ghost hero. Every day, we are doing our best to get things done. It hurts us to buy all kinds of household appliances. Isn't this life suffocating? Why not strive hard to realize your own value. It's not sad that you don't own it every day. Sadly, you don't want to own it. The greatest tragedy of life is the disappearance of dreams and the depletion of life.

Use rdlc reports (1)-(4) FavoritesUse rdlc Report (1) 1. Create a data source Start vs2005 to create a form project named testproj Select "Add new data source" in the form on the left or click "Add new data source" on the menu ": Select the dialog form and select "Database" to go to "Next ": This data source uses th

as hardware raid, and features are not as good as hardware raid. Next we will introduce various RAID technologies I. RAID 0 The band technology is used to write data in parallel on multiple disks in bytes or bits (the starting offset of each disk is the same, and the subsequent segments of a certain number of bytes, i/O read/write performance can be improved, but it does not have data redundancy like raid1. Once the hard disk fails, it will be done. The structure is as follows. Ii. Raid

First to analyze: First time: 150Second time: 150/4 = 37 2Third time: (37+2)/4 = 9 3Fourth time: (9 + 3)/4 = 3 3 Initial value 150 bottle of water, which is 150 caps1. Take all the lids to change the water, record the remainder and sum2. (last remainder + last change of water to drink)/4, record rema

1. pointer ConceptThe address of the variable is called the pointer of the variable, and the variable storing the pointer is called the pointer variable.A pointer variable is a variable that stores the address values of other variables. For exampleInt I;Int * pi = I;The pi variable value is the address of variable I. * Is added before the pointer to indicate the memory unit pointed to by the pointer. For example Int I, j; Int * pi; Pi = I; I =

This can also be done through the cyclic shift operation: MoV Al, 12 h; original data in Al MoV CX, 8; Al, byte type, total 8 bits MoV ah, 0; Ah is used as the intermediate register for transposition. The initial value is 0. L_1bit: SHL Al, 1; shifts 1 to the left, and the current highest bit enters cf RCR ah, 1; Ah shifts 1