sdn meaning

Excerpt from: Abs_guide: http://www.tldp.org/LDP/abs/abs-guide.pdf the meaning of shell variable $#,[email protected],$0,$1,$2 in Linux is explained:Variable Description:$$the PID of the shell itself (ProcessID)$!PID of the Shell's last running background process$?end code of the last Run command (return value)$-flag at a glance using the SET command$*all parameter lists.such as "$*" in the Case of "" ", in the form of" $ $ ... $n "output

Root 11-5 0 0 0 S 0.0 0.0 0:00.00 kpsmoused 699 Root 10-5 0 0 0 S 0.0 0.0 0:00.33 mpt_poll_0　　DescriptionStatistical Information Area :The first five elements are the statistical information area of the current system situation as a whole. Let's look at the specific meaning of each line of information.The first line, the task queue information, and the execution res

When you first contact with iOS, every time you build a project, the system will automatically generate a Appdelegate class, which a variety of functions, for beginners of me, is really a little confused, do not know how to use, Today we will talk about some usages and meanings of appdelegate. Look at the meaning of some functions in the APPDELEGATE.M file. //Appdelegate.m////Created by Kenshin Cui on 14-2-23.Copyright (c) 2014 Kenshin Cui. All righ

is generally divided into two parts, one is the physical structure, and the other is the logical structure. The physical structure consists of a flat structure and a tree structure. The flat structure is that all pages in the site are at the root level, forming a flat physical structure. This is more suitable for small sites, because if too many files are placed in the root directory, making and maintenance is more troublesome. And the meaning of the

options:nsjsonreadingoptions error:error];Nsjsonreadingoptions has three enumeration values, meaning the following:1.nsjsonreadingmutablecontainers:specifies that arrays and dictionaries is created as mutable objects.Specifies that the method creates an array and that the dictionary is a mutable object. (meaning that the dictionary and array in the JSON object returned by the Jsonobjectwithdata method are m

The shell condition determines if the-Z to-D meaning[-A file] is true if file exists.[-B file] True if file exists and is a block special file.[-C file] True if file exists and is a word special.[-D file] True if file exists and is a directory.[-E File] True if file exists.[-F file] True if file exists and is a normal file.[-G file] True if file exists and Sgid has been set.[-H file] True if file exists and is a symbolic connection.[-K file] True if f

Simply say the meaning of these few paths:__dirname: Gets the full directory name of the directory where the current execution file is located __filename: Gets the file name with the full absolute path to the current executable PROCESS.CWD (): Gets the folder directory name when the node command is currently executing./: directory where the files are locatedLet's take a look at the current directory structure of my Computer:syntax/ -

initialized final variable to another objectIn=inclass2;The following statement succeeds, although the reference cannot be changed but the contents of the object itself referenced by the final variable can be changedIn.mod (a);}Class inclass{int li_a=0;Public Inclass (int a) {Li_a=a;}public int mod (int b) {Li_a=b;return li_a;}}public static void Main (String args[]) {int a=100;Internal class initializationTest3 test3=new Test3 ();Test3.inclass in=test3.new Inclass (30);System.out.println (IN.L

Thoroughly understand the meaning of this keyword This keyword is a concept that I think is very difficult to understand, and it may be the reason for being too stupid. This keyword means that the appropriate handle can be generated for the object that has called its method. How do you understand this passage? Thinking in Java has an example There are two objects of the same type, called A and B respectively, so how do we distinguish who calls th

The meaning of voidVoid is "no type" and void * is "no type pointer" and can point to any data type. void pointer Usage specificationA ①void pointer can point to any type of data, that is, an assignment to a void pointer using a pointer to any data type. For example:int *pint;void *pvoid;PVOID = pint; * * but can not pint = pvoid; */If you want to assign pvoid to other types of pointers, you need to force type conversions such as: pint = (int *) pvoi

And since Ruby is a completely pure object-oriented language, anything is an object, the method is an object, and the class is an object ..., so self has a lot of environments that distinguish the self meaning of different environments to better understand the meaning of the program. First level Ruby Code Puts self Print out Main, which represents the default object main. Second, in the definition of class

http://blog.csdn.net/peterwanghao/article/details/40071857 Original Address removeabandoned Meaning and use formerly known as: Using the Druid Connection pool's timeout recycling mechanism to troubleshoot connection leakage issues Summarize: Meaning: Whether to open automatically clean up the leased connection but not return to the thread pool Role: 1. Put in activeconnections when renting 2.DyestroyTask t

the header file is to prevent the header file from being repeatedly referenced.So #ifdef __cplusplusextern "C" {#endif#ifdef __cplusplus}#endif What is the role of it. We will come in the following one by one ways. 3. Deep disclosure of extern "C" The extern "C" contains a double meaning, literally: First, the object modified by it is "extern"; second, the target it modifies is "C". Let's take a detailed interpretation of th

QQ Space burst praise what meaning At present, mobile QQ can be super, space inside the dynamic display is "Super Praise Me", and the mobile phone QQ on the written is "burst praise me", in fact, is a meaning. QQ Space Super Praise How do I do? 1, first of all you find a friend to say, you can see the following point praise button. 2, in accordance with the usual routine is to click on it, this time

http://ssailyang.iteye.com/blog/413518 Turn from: http://stevenit.bokee.com/viewdiary.30578007.htmlAlthough many people will use dsadd and other commands to add users, but dsadd instructions inside does not involve the meaning of Dc,cn,ou, many people do not understand, here is Microsoft's technical support staff's reply, hope to help.CN, OU, DC are the distinguished names in the end strings of the LDAP connection server (DN, distinguished name)The c

Linux "ls-al" displays directory permissions that differ from file permissions:Drwxrwxrwx-rwxrwxrwxIn this case, the row "D" on the directory is a directory, and the next line "-" is a file. In the permission representation of the directory, r is readable, meaning that the directory structure of the directory can be read, and can be understood to show the content when LL. W is writable, meaning that the fil

Guide: "SEO more and more complex, 10 years ago, SEO from the page accumulation of keywords into the chain of construction, and now the SEO from the chain into brand, user experience, socialization. "The above quotes from Zac's insights into the new era of SEO. New media, mobile interconnection, it technology, digital technology, the latest development, leading the internet to carry out a new era. The major search engines for the benign development of the Internet, the search optimization requi

work content is quite messy, must understand constructs the station, must understand the soft article, must understand the server. However, SEO training has to have a focus, not generalities. The most important is based on the current SEO industry needs to train the required talent, outdated training content has little meaning. when will SEO training be able to restore its true meaning? We treat the atti

Often used when connecting db, just do not know what the meaning of the representative ... Often used when connecting db, just do not know what the meaning of the representative ... Rs. OPEN sql,conn,a,b A: adOpenForwardOnly (=0)Read-only and the current data record can only move Down adOpenKeyset (=1)Read-only, the current data record is free to move adOpenDynamic (=2)Can read and write, the current d

1, the meaning of the reference References 变量别名 exist, so in some cases you can substitute pointers for better readability and usability relative to pointers The implementation of the SWAP function is compared to void swap (int A, int b) { int t = A; A = b; b = t;} void Swap (int* A, int* b) { int t = *a; *a = *b; *b = t;} Note: The reference parameter in the function does not need to be initialized, and initialization is done