level 3 router

3. Run-level scripting introduction3.1. Operating levelOperating level Description:0 Turn off the machine1 Single-User mode2 Multi-user mode, no NFS service3 Multi-user mode4 not currently used5 X startup mode for Windows6 Restart your computerThe directory that corresponds to the run level (/etc/rcn.d,n is the number

From: Stairway to Database Design level 3:building Tablesauthor Joe Celko,translation: Liu Jongmao Shesheni Xu Yali Lai HuifangPresidentIs it completely new for designing and creating a database? It doesn't matter, Joe Celko, one of the most-read SQL authors in the world, will tell you these basics. As always, even the most professional database veteran will surprise them. Joe is Dmbs magazine, the most pop

Chapter 3: Lan Basics 1. LAN topology: Bus, Star, and ring. 2. there are three types of shared media LAN defined in the IEEE 802.2 standard: Bus-type LAN Using the CSMA/CD media access control method (developed by 802.3) and Token Bus Media Access Control Method (developed by 802.4) and uses the Token Ring Media Access Control Method (developed by 802.5. The first type of shared media LAN is the most commonly used, also known as Ethernet. All nodes in

/releases/view/93587 example of WHERE clause in a correlated subquery shows the assumptions used in the WHERE clause of a correlated subquery, I want to find out that the CustomerID have purchased more than 70 styles. In order to complete this requirement, I can run the code:SELECT CustomerID from Sales.SalesOrderHeader OHWHERE (SELECT COUNT (*) from Sales.SalesOrderDetailWHERE SalesOrderID = OH. SalesOrderID) > 70;Listing 1: In the WHERE clause of the related subquery when I run the code in

: Addslashes (), the function of both functions are to escape the special characters, then which function is better? Baidu a bit, found that everyone is also uncompromising. Some people say that the mysql_real_escape_string () function needs to be connected to the database beforehand, it may error, so it is recommended to use Addslashes (); others say Addslashes () filter is not strict enough, recommend using Mysql_real_ Escape_string (). In Dvwa it is obvious that mysql_real_escape_string () is

': {}, - }, $ 'Shandong': {}, $ } -Exit_flag =False - the while notExit_flag: - forI1inchMenu:Wuyi Print(I1) the -Choice1 = input (">>> Select a menu 1>>>:") Wu ifChoice1inchMenu: - while notExit_flag: About forI2inchMenu[choice1]: $ Print("\ t", I2) - -Choice2 = input (">>> Select Level Two menu 2>>>:") - ifChoice2inchMenu[choice1]: A while notExit_flag

1 #Task:2 #Show Level 3 menu3 #Level 1 Menu # shows 3 cities + 1 Beijing 2 Shanghai 3 Guangzhou4 #Level 2 Menu #显示 Select 1 Beijing = B1 B2 B35 #Level 2 Menu #显示 select 2 Shanghai = S1

See write the following level of code, people will be gas-blown, and he said can not write, naming norms, code reuse, he was impatient, began to anger godless, and then vent the same all kinds of venting dissatisfaction, but also to the good sound of comfort ... the performance of his work on weekdays:1, write out of a variety of pits, a small modification are countless loopholes error, this side blocked another out.2, the name is not standardize

size-I view I Node ID (inode)Directory processing commands: mkdir Create a directory midir-p To create a directory recursively Switch Directory command: CDCD ~ Back to home directory CD-go to the last catalog CD. Go to the top level directoryThe TAB key has the command, the file name complements the function, is very useful in the actual operation.PWD prints out the current locationRmDir Delete directory, but can only delete empty directory, this com

Http://www.pythonchallenge.com/pc/def/equality.htmlAccording to the page tip: A lowercase letter is just right to be surrounded by 3 uppercase letters around.View the page code to get the characters that need to be processed.Copy characters to document/tmp/s.txtPython:Import reWith open ('/tmp/s.txt ', ' R ') as F:Content=f.read ()Raw_letter=re.findall (' [A-z]+[a-z]{3} ([A-z]) [a-z]{