Linux

GDB has not been used to debug the program feel that GDB is a very magical thing, if you use it to debug a guarantee you want to forget it is difficult, the following look at its true!GDB OverviewGDB is a powerful UNIX program debugging tool

Linux The next DB instance listens for boot settings2016/5/16 ZhankyScript IntroductionBefore we get started, let's start by introducing a few scripts that will be used.OratabOratab files are created when you create a DB instance, and are executed

Rename This command is used to modify the file name, especially for batch modification of files with similar formatting.Rename used in the format: rename the file string to replace after the file string is applied to the rangeThe use of rename can

Position anchoring in 1.grep for specifying where characters appear     ^  anchor beginning,^char         $  Anchor Line end,char$        ^$  Blank line          \   Anchor ending =char\b        grep group     \ ( \  )     \ (ab\) *xy   indicates AB

1. Take the virtual machine as an example, add a new hard disk to the virtual machine, create an LVM group, and use the new hard disk to hold the Oracle database files.2. Fdisk-ll to see if the newly added hard drive is recognized, and the SDB has

Three time parameters for a file under Linux(1) Modification Time (mtime): Content modifiedThe modification time here refers to the content of the text changes, and the time of the update.Eg: Save the file after VI. (2) Status Time (CTime): status

Learn the auth of Linux. Generally, r-xw:write, modify and delete-2r:read-4x:execute-1 A file has 3 auth show:-owner-group-other when using sudo Use the root user's identity, so the new file or dir is the root user and not your own. At this point,

Introduction to Interprocess communication (excerpt from Linux network programming P85)At/T introduces several new methods of process communication in UNIX System V, namely, Message Queuing (messagequeues), Semaphore (semaphores), and shared memory,

FFmpeg compiled into the Android library has a lot of cases, compile optimization neon also a lot of, the following is my success through the case, here is mainly about compiling the configuration file, other settings can be combined with Linux

File Lookup: Locate, findNon-real-time lookup (Database lookup): LocateReal-time Find: FindLocateWorking mode:(1) dependent on pre-built indexes(2) The index is built automatically when the system is idle (recurring tasks)(3) Manually updating the

Command:(1) File system relatedDirectory ManagementFile ManagementFile ViewFile editing(2) System Management relatedDirectory-related commands:Current directory or working directoryHome directory: HomeRoot:/rootNormal User:/home/username~: User's

First, IntroductionThe date in Liunx is a very common command used to display the modified time, as followsSecond, the syntax formatusage:date [OPTION] ... [+format]Iii. Common Options%y #显示年份的最后两位%Y #显示Full year%m #显示月份%M #显示分钟%h #显示月%H #显示小时%s #

Environment : redhat7.0The required Packages : Redhat installation image1, installation redhat6.5Only some parameters of the image to be encapsulated and the modified files are described here.For specific installation, please refer to

1. Function: Move the file or modify the name of the file2. Usage: MV [option] source file destination file or source file destination directory3. Parameters:-B,--Backup[=control] to back up existing files-F,--force forced override-I,--interactive

The Whereis command can only be used for program name searches, and only binary files (parameter-B), man description file (parameter-m), and source code file (parameter-s) are searched. If the argument is omitted, all information is returned.(1)

****************************************************date:2016-05-07 time:10:53:42 author:gaojiaxing****************************************************File Management Commands1. LS: Lists the files under the current path1). Ls-l: Displayed in long

1. ctrl+alt+enter: You can make the virtual machine full screen.2. Tab key : command and directory completion. Click Auto-Complete, and double-click to list all commands or directories that you can complete.3. CD: Change DirectorySimplified:CD ~ (or

1. Common instructions and permission comprehensionOne.Computer architectureVon Neumann architecture: Input device, memory (controller, operator). Output device.Environment variables:Path,home,logname,shell,hostname (environmental

Linux adds a new hard disk to an existing logical volumeIn order to make full use of the resources, you want to use the extra hard disk to expand the existing machines, can be used to store the backup files.Environment:Operating system, Centos 6.5 x8

Multiple threads may have conflicting access to shared data at the same time, for example, two threads have to increase a global variable by 1, which requires three instructions on a platform:从内存读变量值到寄存器寄存器的值加1将寄存器的值写回内存Assuming that two threads