little leaps learning system

do not call a folder, but called a directory. Ls-l View the first attribute is ' d '.3) Link file: Ls-l View the first property is ' L ', similar to a shortcut under Windows. This kind of file is very common in Linux, and it is used in a lot of routine system operation, so we should pay attention to this kind of file.4) Device: Some files related to the perimeter of the system are usually concentrated in t

check the log recordsChunks can know that the file has a problem, so you can do a consistent check on the problem.To view the time status information for a file:Mtime: File modification time (ls default display)CTime: File creation timeAtime: Last access time for filesView command: Ls-al--time=ctime/atime PATHLink:Hard Links:Meaning: A hard link is a copy of the Inode attribute of a fileAdvantages: So in the deletion of the previous file, in fact, the data is not really deleted, only the link a

(Recursive) display (directories under subdirectories are displayed recursively)Cd:change Directory (toggle current directory)CD back to home directory, home directories, home directoryCD ~username: Enter the home directory of the specified userCD-: Switch back and forth between the current directory and the previous directoryType: Shows which type the specified command belongs toCommand type:Built-in command (shell built-in), internal, built-inExternal command: There is an executable file corr

changes the destination address of the locally generated package. The postrouting chain changes its source address before the package leaves the firewall.The mangle is primarily used to modify the TOS (type Ofservice, service type), TTL (Time tolive, lifetime) value of the packet, and to set the mark mark for the packet to implement QoS (Quality of service,Service quality) tuning and Policy Routing applications are not widely available due to the need for appropriate routing device support. Fiv

is:Owner-->facl,user-->group-->facl,group-->otherUse ACLs to set additional permissions for a fileSetfacl [-m|-x] [ug]:[username| GROUPNAME]:P erm FILE (Prem is an octal number )-M: Set ACL-x: Remove the ACL, Note that it is time to cancel the ACL, and do not need to add permissions. -U: Specifies the permissions that the user has on the file-G: Specifies the permissions that the user group has to the fileSo how do you get an ACL that is already set?Getfacl FILENext, we introduce several comman

Linux Operating system Basics First, the basic principles of Linux:1, consisting of a small program with a single purpose; a combination of small procedures to complete complex tasks;2, all documents;3, try to avoid capturing user interface;4. The configuration file is saved as a plain text file.Second, the interface :GUI Interface (Graphics interface):Gnome:cKde:c++XFaceCLI Interface (command line interface):(Command Prompt):#:root Users$: Normal

the/var directory under the master root and belong to the group mail;Find/var-user Root-group Mail2. Find files that do not belong to Root,bin or student in the/USR directory;Find/usr-not-user root-a-not-user bin-a-not-user StudentFind/usr-not \ (-user root-o-user bin-o-user student \)3. Find files that have been modified in the last week and not belonging to root and student users in/etc directory;Find/etc-mtime-7-not \ (-user root-o-user student \)Find/etc-mtime-7-not-user root-a-not-user Stu

When we press the Host power button, the Cmos/bios module on the motherboard will perform a firmware self-test to check that the hardware is properly connected.In the Linux boot process, you can generally be divided into the following major processes:1, firmware firmware (cmos/bios), POST (Power On Self test), that is, power on2. Bootloader bootloader (GRUB), load the system into the kernel3. Drive hardware loaded into kernel kernel4. Startup process

interface for queue operations: http://blog.csdn.net/qlx846852708/article/details/43666927Data structure C language implementation: Http://blog.csdn.net/qlx846852708?viewmode=contentsThis file is a queue implementation of the Bank queuing system, the above connection is my implementation of the queue interface implementation.#include  C Language Learning Queue Realization Bank queuing

;Private uitable table;Private float tablewidth, tableheight;Use this for initializationvoid Start () {Table = GetcomponentLevel = Getcomponentinchildrenint columns = Table.columns;Calculate row for tableint count = Transform.childcount;int rows = count% columns = = 0? Count/columns:count/columns + 1;Calculates the width and height of the table, based on Ngui, which is its own original sizetablewidth = Columns * (level.width + 2 * table.padding.x);Tableheight = rows * (level.height + 2 * table.p

Originally in the online search data inadvertently found this system, share to everyone: Need will maven + Springboot technology can not understand the first of their own Baidu; Learning-oriented open source framework, concise and efficient, reduce the transition package, show the nature of technology Springboot as the basic framework, using mybatis as the persistence layer framework Use the official re

If the grid is displayed, the code should look like this: Where col-*-* represents the column widths occupied by different types of devices in the grid system Minimalmobile Phone ( Smallflat Panel (≥768px) incomputer (≥992px) Bigcomputer (≥1200px) Container Max width None (Auto) 750px 970px 1170px Class name Prefix .col-xs- .col-sm- .col-md- .col-lg-

related to the work of AD administration, which are located under the $appl_top/ad/12.0.0/bin directory, these script tasks are divided into the following categories:File Generation TasksFile System maintenance tasksDatabase Maintenance TasksDatabase entities compilation and reloading tasksExample: Adpatch is used to patch, adconfig.sh can be used to report the relevant configuration information, and so on, these script generated information is locat

command-line mode: For I in {1..10};d o echo $i;d one =========================================== while loop statement usage while condition to meet cond Ition executes the cmd do-cmd-done bash-x to run the script in debug mode to display the script's running process until loop statement usage: Until condition--G t; does not satisfy the condition, then executes the cmd do cmd-done case multi-conditional Judgment Statement usage: Case value in value 1) CMD1; Value 2) CMD2;; Value

slower;Can not see from the Binlog to copy what statements (encrypted);When executing a stack of SQL statements on a non-transactional table, it is best to adopt statement mode, otherwise it is easy to cause the data inconsistency of the master-slave server;In addition, for the system library MySQL inside the table changes when the processing criteria are as follows:If the use of Insert,update,delete direct operation of the table, the log format acco

ARM Architecture and System Learning (II.)--level 3 pipelineTags: storage embedded assembler C2012-04-18 00:44 5414 People read Comments (4) favorite reports Classification:ARM7 (+)Copyright NOTICE: This article for Bo Master original article, without Bo Master permission not reproduced.See a lot of the Assembly on the return of the program and the return of the processing address are very special, think

verification Step 7: Simple Analysis of the cryptographer encryption module, custom encryption interfaces, and usage-Part 1 Step 7: Simple Analysis of the cryptographer encryption module, custom encryption interfaces, and usage-Part 2 Step 8. Use the configuration setting module and other methods to classify and manage enterprise database configuration information Step 9: Use the policyinjection module for AOP-PART1-basic usage Step 9: Use the policyinjection module for AOP-PART2

Tags: Linux uptime8.13 "Linux learning is not difficult" Linux Common Operations Command (uptime): The command shows the time the system has been runninguse the Uptime command to show how long the system has been running, which in turn displays the following information: The current time, how long the system has been r

Linux system learning Memorandum 4 This is the fourth article in this series, mainly involving File System 4.1 files in the Windows operating system series. our file concepts may be limited to some audio, documents, and so on, in Linux, everything is a file, including processes, serial interfaces ,... linux

implementation of the problem, but the specific details are not mentioned, We should only have a general understanding of the most Linux file system, and the reader asked me what books I read, here I explain, read the Linux kernel programming, and have a deep understanding of the Linux kernel as well as the various materials on the Web or other good blog written by Daniel. Here I summed up a bit, and I do not understand and feel important to say a bi