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Learn these Linux commands

Learn about these Linux commands-general Linux technology-Linux technology and application information. My colleagues spoke about the on-site analysis and post-event analysis of the linux system. I think I still need to be familiar with it. Many commands are not commonly used, but I still need to find help when I use them. It is too troublesome, all of them are listed below. 1. Create a file touch xxx 2. Create a folder named mkdir yyy. 3. Copy cp-ai xxx yyy to copy xxx to the yyy folder, and r

System programming concepts and file attributes

[[Email protected] Data]# Touch/data/mnt1/test[[Email protected] data]# ls/data/mnt21.C data ls new_data testWhat is a bind mount?Starting with kernel version 2.4,linux supports creating a binding mount, which refers to mounting a directory or file at another point in the filesystem hierarchy, which causes the file or directory to be visible in both places, and the binding mount is similar to a hard link, but there are two differences: Binding from preoccupations can span multiple file

WEBX Study Notes (iv) WEBX Turbine

branchesObviously, " homepage " satisfies the condition attached to the first : meaning that the suffix of target does not exist ( null ) or is " jsp " or vm "". -Execute actionUnlike the action concept in other frameworks, in WEBX turbine, an action is used to process a user-submitted form.Because the action parameter is not provided for this request, skip this step. -Find and execute screen. A rule is used here: target maps to the rules of the screen module class name. Assuming tha

Install and use MySQLdb and MySQLdb

= cursor.exe cute.pdf (SQL, param)Print "insertworkflow", n# UpdateSQL = "update thinkgamer set name = % s where name = 'aaa '"Param = ("zzz ")N = cursor.exe cute (SQL, param)Print "updata", n# QueryN = cursor.exe cute ("select * from thinkgamer ")For row in cursor. fetchall ():Print rowFor r in row:Print r# DeleteSQL = "delete from thinkgamer where name = % s"Param = ("bbb ")N = cursor.exe cute (SQL, para

Installation and use of MYSQLDB

= ' aaa '"param = ("zzz")n = cursor.execute (Sql,param)Print "Updata", n #查询n = Cursor.execute ("SELECT * from Thinkgamer")For row in Cursor.fetchall ():Print rowFor R in row:Print R #删除sql = "Delete from Thinkgamer where name =%s"param = ("BBB")n = cursor.execute (Sql,param)Print "Delete", n #查询n = Cursor.execute ("SELECT * from Thinkgamer")Print Cursor.fetchall () Cursor.close () #提交Db.commit ()#关闭Db.clos

[Object-oriented]: Interface

Preface: InterfaceIt is a very important thing in object-oriented systems.I try to use indicators to explain the operation of interfaces. Interface: Below is a piece of program code for the interfaceThe program code is simple, that is, classa implements isamplex. public interface ISampleX{ void XXX(); void YYY();}public class ClassA : ISampleX{ public void XXX() { // ... } public void YYY() { // ... } public void ZZZ

Symbian "error: Jump to case label"

When I compile my program, it is okay to compile it on the simulator. However, the compilation fails when it is switched to the phone release (gcce) environment, and common descriptors such as tbuf, which are usually defined at ordinary times, are also incorrect. The reason for finding them online is that there is a problem during the switch case, when case is a statement, you can Switch (XXXX){Case yyy: Zzz;Break;Case yyy:Zzz;Break; Default:Break;

[Object-oriented]: Inheritance

Preface: InheritanceIt is intended for beginners. Something that you can understand is a bit vague.I try to explain the inheritance operation by expanding the program code. Inheritance: Below is an inherited program codeThe program code is simple, that is, classb inherits classa. namespace ConsoleApplication1 { public class ClassA { public void XXX() { // ClassA Code } private void YYY() { // ClassA Code } protected v

Formatted output date and time

If you want to output the date and time format you want, it is necessary to use the SimpleDateFormat class, which is the only non-abstract subclass of the DateFormat class, which has a powerful function in displaying the date and time. For example, to output "Sunday 2004.06.06 at 06:53:01 pm CST", as long as an instance is explicitly constructed: SimpleDateFormat formatter=new SimpleDateFormat ("E yyyy. Mm.dd ' at ' hh:mm:ss a zzz '); where e represen

Installation and use of MYSQLDB

First, installationInstall the compiled version (this method is quick and easy):Http://www.codegood.com/downloadsDownload according to your system, double-click Install, fixThen import MySQLdb to see if it was successfulMy, win7,32 bit, version 2.7Mysql-python-1.2.3.win-amd32-py2.7.exeSecond, use#!/usr/bin/python# Encoding:utf-8Import Time,mysqldb# Open Database connectiondb = MySQLdb.connect ("localhost", "root", "root", "Python")# get an action cursor using the cursor () methodcursor = Db.curs

How can I query three tables by page?

How can I query three tables by page? How can I query three tables by page? For example, Table Id name 1 aaa 2 bbb 3 ccc Table B 5 ddd 6 eee 7 fff Table C 4 aaa 8 zzz 9 xxx How can I query the results? Sort by ID in reverse order 9 xxx 8 zzz 7 fff 6 eee 5 ddd 4 aaa 3 c

Python Full Stack development * Threads Queue Thread Pool association * 180731

One. Thread queueQueue:1.Queue Advanced First Out Self-locking data security From queue import queue From multiprocessing import queue (IPC queue)2.LifoQueue LIFO Last in, first out Self-locking data security fromQueueImportLifoqueue LQ=lifoqueue (5) Lq.put (123) Lq.put (666) Lq.put (888) Lq.put (999) Lq.put (" Love") Print(Lq.put_nowait ("Miss"))#error queue. full Print(LQ)# Print(Lq.get ())# Love Print(Lq.get ())#999 Print(Lq.get ())#888 Print(Lq.get ()

Discussion on some problems of ng-view in angular JS

/yyy.html", Controller: "ZZZ" }). Otherwise ({ Redirectto: "/hello" });});Ctrls.controller (' Helloctrl ', [' $scope ', function ($scope) { $scope. hello= "Hello World";}]);After testing, the method is feasible.2. Write separatelyApp.js:var app=angular.module ("AAA", [ "Ngroute", "Ctrls"]);App. Config (function ($routeProvider) { $routeProvider. When ("/hello", { Template

Learning C ++ templates from scratch (1): function templates, function template specialization, overload function templates, and non-template function Overloading

has been compiled twice. Before instantiation, check the template code to check whether the syntax is correct. Here, you will find a syntax error, if a semicolon is missing.During the instantiation, check the template code to see if all calls are valid. Invalid calls will be found here, for example, the instantiation type does not support some function calls or operators. 4. normal functions can be compiled smoothly only by declaring them. For template compilation, You need to view the templ

Let you know software development in advance (26): Database script comments

procedure pr_XXX @ AAA varchar (30), -- description1 @ BBB int, -- description2 ...... As Begin Declare @ CCC int, -- description3 @ DDD varchar (100), -- description4 ...... ...... -- YYY (name) add YYYYMMDD for ZZZ begin ...... -- YYY (name) add YYYYMMDD for ZZZ end ...... Statement1 -- YYY add YYYYMMDD description5 ...... Statement2 -- YYY modify YYYYMMDD des

Xposed Hook Technology for Android reverse analysis

, compared to Android in the LOG.D (),It can show the thrown exception, while Android log is not available. The second Android log is needless to say, I use both of them here.After writing, we repack the module and install it on the phone, then let the phone soft restart, each update installation module must be restarted to take effect.OK, after reboot, let's run the target application, enter the account password ~Then look at the log options in Logcat and Xposed in Android Studio:As you can see

POJ1420 Spreadsheet (topological sort) Note that hyper-memory

cells. So each spreadsheet can is fully computed.The name of a cell consists of one to three letters for the column followed by a number between 1 and 999 (including) for The row. The letters for the column form the following series:a, B, C, ..., Z, AA, AB, AC, ..., AZ, BA, ..., BZ, CA, ... ZZ, AAA, AAB, AAC, ... Aaz, ABA, ..., ABZ, ACA, ..., ZZZ. These letters correspond to the number from 1 to 18278. The

Python Learning (1)

Print (I, end = ")Print across a space.Continue: Stop this cycle and start the next cyclePass: Skip a block and continue with the code break: Exit the looping column appendExtend is used to add more than two:1>>>member.extend (['zzz','AAA'])2>>>member3['Little Turtle','Small Pudding','Night','Stray','Yi Jing','Lucky Lu Doll','zzz','

QT Primer-list box Qlistwidget class

* Item) Sets the currently selected item to item. (10) void Setcurrentrow (int row) Sets the current selection. (11) void setsortingenabled (bool enable) Sets whether the sort feature is enabled. (12) void Sortitems (Qt::sortorder order = qt::ascendingorder) To sort a list box, the value of the parameter can be: Qt::ascendingorder 0 The items is sorted ascending e.g. starts with ' AAA ' ends with ' ZZZ ' i

Let you know ahead of time Software development (26): Database scripting Gaze

("") null,--Description4. . . . . .)6. Gaze of the stored procedureGenerally speaking. The stored procedure contains more SQL statements, so the gaze is more complex. Even so, there must be a gaze in the place of some key statements. Otherwise developers will be more laborious to read.The writing of stored procedures and the gaze can be made using the following style ( in the case of the Sybase database Syntax ):CREATE PROCEDURE Pr_xxx@AAA varchar (+

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