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features strong and stable 4) independent operation.3. Linux has the following advantages: 1) stable system 2) free or little cost 3) security, vulnerability quick fix 4) multitasking, Multi-user 5) User and Group planning 6) relatively non-resource-intensive systems 7) suitable for embedded systems requiring a small core program 8) integrated and diverse GUI for graphical user interface4. Linux has the following disadvantages: 1) No specific support Vendor 2) game support less than 3) professi

Previous NodeU Move up one layerS (/) search in Info pageH Display Help options？ Instruction ListQ End this info page Observing the state of use of the systemIf you want to see who is online, you can release the "who" this directive, and if you want to see the network of online status, you can release "netstat-a" This command, and to see the background of the program can be executed "ps-aux" this command. Synchronizing data to the LED order on the hard disk: Sync Customary shutdown

8th Linux disk and file system managementln [-SF] source file destination file-S: Symbolic connection, if no parameter is a hard connection-F: If the destination file already exists, delete it first and then establish the connectionA hard connection simply writes more than one associated data to a block in a directory and does not use the Inode and disk space. A symbolic connection generates a new inode, which is a new file generated.The file size is the length of the file name string. Therefore

Search: Grep-vn ' the ' 1.txt (v is inverse)4. In conjunction with the previous matching usage, here is a summary of the following:^word: string with search word at the beginning of the lineword$: string with search word at end of line\: Skipping characters, deleting special meanings of special symbols*: Repeat 0 to infinitely multiple of the previous characterN1-N2: Lists the range of characters you want to match^list: Character not in list5. Okay, here's the comparison between the files, main

forward: bC. Turn back one line: ENTERD. Turn one line forward: K5. Find:A./keyword: from front to backB.? KEYWORD: from back to forwardN: NextN: PreviousQ: ExitIv. online Documentation:Info COMMANDV. Documentation:/USR/SHARE/DOCSix, Cal CalendarSeven, echo default has line breakEcho-n Remove line breakECHO-E \ n line breakEight, printf default Start No line break, you have to manually specify \ nIX. FILE:Used to probe the type of a given file. File commands are divided into 3 processes: File s

Absolute path and relative pathAn absolute path is a path from the root directory to a directory, which is written from the root directory, i.e./Relative paths are written from the path of the user's current directoryDirectory-related OperationsCD switch path for example: cd/var/www switch to/var/www/pathPWD Displays the current pathmkdir Create a new directoryRmDir Delete an empty directoryDo not describe the operation, you can use the man to viewCopy move and Delete commandsCp,mv,rmModify Defa

/local/jdk1.6.0_18/lib and/usr/local/jdk1.6.0_18/jre/lib respectivelyUnzip Tools.pack and Rt.pack to Tools.jar and Rt.jar, respectively:unpack200 Tools.pack Tools.jarunpack200 Rt.pack Rt.jar7, Test Java:In the terminal input command:Java-versionAppear:Java Version "1.6.0_18"Java (TM) SE Runtime Environment (build 1.6.0_18-b07)Java HotSpot (TM) Client VM (build 16.0-b13, Mixed mode)The Java installation is complete.8. Uninstall the JDK:Locate the _uninst subdirectory of the JDK installation direc

There are countless kinds of data content that can be customized in Python, but there are six types of system default standards:First, Number typeDivided into four categories:int integral typefloat Float TypeBOOL Boolean typestring literal typeThe string type is the type of text enclosed in quotation marks:Each quotation mark can contain other two-way quotes. You can also use escape characters in a way thatNote:Escape characters:Complex plural typeSecond, list typeA list is a set of sequential

a comma {x,} means that the preceding content appears x or more times, and two numbers separated by commas {x, y} indicate that the preceding content appears at least x times, but not more than y times. We can extend the pattern to more words or numbers: ^[a-za-z0-9_]{1,}$//All strings that contain more than one letter, number, or underscore ^[1-9][0-9]{0,}$//all positive integers ^\-{0,1}[0-9]{1,}$ All integers ^[-]? [0-9]+\.? [0-9]+$//all floating-point numbers The last example is not ve

Today in the old people to write the style of the Web page, encountered this selector, ' ~ ', at that time I was ignorant force, silly confused ' + ' with ' ~ ' difference, although I know they are brothers selector.Later on-line search, perhaps I find the wrong way, did not find the answer I want, so privately take these two selectors to test a bit. It turns out this is the case.First come to the code to speak:(1), ' ~ ' SelectorThe effect is as follows:　　　　　　　　(2), ' + ' selector　　Code or thos

Brother Bird's Linux private dishes are divided into two volumes, respectively, the basic article and server chapter. First of all, I read the background of this kind of books. Bo Master (that is, I ^_^) University of the major is the Linux C language, or called embedded C, the platform used is Linux. By the way, the Linux operating system kernel is written in C, so Linux can be the potential of the C language to show the great, it is recommended to

"Brother Bird's Linux private Dish Basic article (Third edition)"--Learning notes $su, the Pswad that the user defines, is how much. How to view? P322:login Shell and non-login shell, do not understand. P322:~/.bash_profile,~/bash_login,~/.profile, under what circumstances the 3 files were present. Currently on my host, I see only ~/.profile p323: Flowchart p150: Permission issues, can cp/testing/testing testing2/testing2 p193:cp/dir1/file1/dir2 the u

Each seoer has its own a period of confusion, confusion, and the period of doubt and growth, today in this donkey brother said my own SEO on the way to grow ups and downs! That is at the end of 2011, I have sprouted to do a Taobao guest website idea, at that time did not know what is ranking, I only know to do Taobao can make money, as for why can make money, very simple because others say can make money, I believe so I did. Now think really interlac

You're cool in the Yellow Sea east. Today you east frequency of the Yellow Sea to play cool, so humiliating, you are the Northeast, enjoy the cheerful flowing, small river brother is not to be outdone, you see, jump there, Inner Mongolia, even north China, many people saw this touching cool story will shed tears. The sister of the Moon is playing Hide-and-seek with us, if there is no cruel side of the world, naughty little raindrops in people holdin

Today, I saw a sister writing programming mentality, in the tangle is the postgraduate or employment problems, I think as experienced, looking for work, graduation design, graduating senior students, it is necessary to their own experience and a little sentiment to share out, to learn younger brother to learn a little bit of reference, if can let some people feel better. Words to the mouth and do not know where to start, let me briefly introduce my ow

A graduate's heartfelt words: How to spend college life-to learn younger brother October 17th, 2015 One, you love and hate, graduation day will disappear. I remember the days when I graduated from college I listened to the "Phoenix Flowers Open the intersection", heard "time of the river into the current, and finally we separate away." I can't stop the tears, once I can easily say, no longer see the people. When the graduation, but in his notebook to

As a low-level technology, blockchain technology from the initial digital money to smart contracts to the current industry scenarios distributed application implementation, since 2008, 10 years ago, the blockchain from the original theoretical concept to today's actual scenario application landed, although questioned but have been hard to move forward. Especially in the last two years, the re-construction of the existing industry logic in blockchain has made it undisputed the next development of

:2}]}) meets the criteria key=value , while complying with any of the other two conditions One of the data Db.collection.find ({"Key.subkey": Value}) The values in the inline object match, note:"Key.subkey" must be quoted Db.collection.find ({"key": {$not:/^val.*val$/i}}) this is an operator that is used in combination with other query conditions and is not used alone. The result set obtained by the above query condition plus $not can get the opposite set. 2. sorting Db.coll

condition --change age of ID 11 to 35,sex to M valueUpdate Stu set age=35,sex= ' m ' where id=11;Query OK, 1 row affected (0.16 sec)Rows matched:1 changed:1 warnings:0 --Change the data value for ID values 12 and 14 to M,classid to lamp92Update Stu set sex= ' m ', classid= ' lamp92 ' where ID in (12,14);Query OK, 2 rows affected (0.09 sec)Rows matched:2 Changed:2 warnings:0Delete data Format: Delete from table name [where condition] --delete data in the Stu table with an ID value of 100Delete f

MySQL Flip-flopFormat: 1, trigger definition:CREATE TRIGGER trigger_name trigger_time trigger_eventOn tbl_name for each ROW trigger_stmtDescription# Trigger_name: Trigger Name# Trigger_time: Trigger time, desirable value: before or after# Trigger_event: Trigger event, desirable value: INSERT, update, or delete.# Tb1_name: Specify on which table# trigger_stmt: Triggers the processing of SQL statements.Example:Mysql> delimiter $$Mysql> CREATE trigger Del_stu before delete on Stu for each rowBeginI