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Use MMAP/dev/MEM to read and write Linux memory-root permission

Use MMAP/dev/MEM to read and write Linux memory Category: Linux Kernel 114 reading comments (1) Favorites Report Use hexedit/dev/MEM to display information in all physical memory. Use MMAP to map/dev/MEM, and then directly read and write it to implement kernel operations in the user space. Below is a sample I wroteView plain # Include # Include # Include

Explanation of/dev/null in Linux

In Linux, the explanation of/dev/null is in Linux/Unix. Generally, the information displayed on the screen is from stdout (standard output) or stderr (standard error output. Many people will ask why output is output and cannot be sent to the screen. Why should it be divided into stdout and stderr? This is because almost all programs run on the background in the server's working environment. Therefore, to facilitate debugging, when designing a program,

Linux 1 & gt;/dev/null 2 & gt; & amp; 1

Linux 1>/dev/null 2> 1 meaning shell may often see:> the result of the/dev/null 2> 1 command can be defined in the form of %>. Output/dev/null indicates an empty Device File> indicates the redirection location, for example: echo "123">/home/123.txt 1 indicates stdout standard output. The default value is 1, therefore, ">/de

/Dev/sdc1 is apparently in use by the system; will not make a filesystem here!

Background: Server: Dell Three raid groups: SDA (raid1) System Disk SDB (RAID5) application data disk, in use SDC (RAID5) not used, file system to be created, Mount LVM not used Operating System SuSE 11 Enterprise Problem description: After Dividing SDC into partitions (with only one partition), create a file system, mkfs-T ext3/dev/sdc1, run the command, and the network is disconnected. Process Termination. Log on to the recovery network an

# Pvcreate-F/dev/rdsk/c0t4d0

1. Backup all user data in the volume to be removed(Use fbackup, cpio or tar Backup utilities as appropriate .)2, determine the names of the logical volumes residing in the volume groups to be removed# Lvdisplay/dev/vgxx/lvol *3. unmount all logical volumes in the volume group to be removed# Cd/# Umount/dev/vgxx/lvol *4. Remove the logical volumes found in step2 from the volume group# Lvremove/

Webpack with hot compilation webpack-dev-server

Why do I find that every time I build a hot compilation is different, but this time should be considered the most scientific way. webpack.config.js only need to pay attention to increase the thickness of the place. This is the core, and the rest is just a demonstration of the actual situation.varWebpack = require ("Webpack");varHtmlwebpackplugin = require (' Html-webpack-plugin ')); Module.exports={entry:{JQ: [__dirname+ '/src/js/jq/jquery-1.9.1.js ', __dirname+ '/src/js/jq/jquery.urianchor-1.1

Vue simulates background data, requests local data configuration (old version dev-server.js, new version webpack.dev.conf.js)

Recently learning a VUE-CLI project requires data interaction with the background, where local JSON data is used to mimic the background data interaction process. However, there is no dev-server.js file found under the build folder because the new version of Vue-webpack-template The dev-server.js has been removed and replaced by the Webpack.dev.conf.js file, so local access can be configured in Webpack.dev.

The problem of redirecting Stdin,stdout,stderr to/dev/null in the daemon daemon

Some people think that the background daemon to do this kind of redirection operations waste resources, we recommend that the 0, 1, 2nd sentence directly closedHandle down, which is very incorrect. If they are actually closed, some ordinary data file handles will waitIn 0, 1, 2. In the case of a number 2nd handle, some library functions fail to output an error message to the 2nd handle, which breaksBad old data.1, the following code will be stdin, stdout, stderr redirect to/

Elevation of permission for devices read/dev by Android applications (2)

Elevation of permission for devices read/dev by Android applications (2)In privilege escalation for devices in/dev for Android applications (1), two methods of privilege escalation are briefly summarized: Device_initAnd Init. RC. In this article, I will summarize in detail that it is easy to confuse people without being careful. Init. c, Device_initAnd Init. RCHow do they work. Directory structure ls: Syst

Shell ">/dev/null 2> & 1"

[From] http://www.ixdba.net/a/ OS /linux/2010/0422/35.html Shell may often see:>/dev/null 2> 1 Command results can be defined in the form of %> Break down this combination: ">/dev/null 2> 1" is five parts. 1:> indicates the redirection location, for example, echo "123">/home/123.txt2:/dev/null indicates that the device file is empty.> Indicates stderr standard

Linux/dev/shm analysis

In linux, the/dev/shm system loads/dev/shm by default. it is called tmpfs. some people say it is different from ramdisk (virtual disk. Like a virtual disk, tmpfs can use your RAM, but it can also use your swap partition for storage. And traditional virtual magnetic... In linux, the/dev/shm system loads/dev/shm by defa

>/dev/null 2>&1 meaning

Break down this combination: ">/dev/null 2>1" is part five.(1 for standard output, 2 for standard error output, 2>1 to redirect standard error output to standard output)Where does the 1:> delegate redirect to, for example: echo "123" >/home/123.txt2:/dev/null represents an empty device file3:2> indicates stderr standard error4: means equal to, 2>1, 2 output redirect equals 15:1 means stdout standard output,

Int s3c24xx_serial_probe (struct platform_device * Dev,

Drivers/tty/serial/Samsung. c Int s3c24xx_serial_probe (struct platform_device * Dev, Struct s3c24xx_uart_info * info){Struct s3c24xx_uart_port * ourport;Int ret; Dbg ("s3c24xx_serial_probe (% P, % P) % d \ n", Dev, info, probe_index ); Ourport = s3c24xx_serial_ports [probe_index];Probe_index ++; Dbg ("% s: initialising port % P... \ n", _ FUNC __, ourport ); Ret = s3c24xx_serial_init_port (our

Webpack Study (iii) Webpack-dev-server cannot automatically refresh the problem

Use Webpack-dev-server to encounter problems that cannot be automatically refreshed by the browser;Here are some points to note:1.webpack-dev-server does not read the configuration of your webpack.config.js output!!You're in webpack.config.js. The configuration output property is used when you use Webpack to pack, and it doesn't work for webpack-dev-server.2.webp

Shell standard output error >/dev/null 2>&1 analysis "Go" in Linux

The shell can often be seen: >/dev/null 2>1Eg:sudo kill-9 ' ps-elf |grep-v grep|grep $1|awk ' {print $4} ' 1>/dev/null 2>/dev/nullThe result of the command can be defined in the form of a%> output/dev/null represents an empty device fileWhere does the > delegate redirect to, for example: echo "123" >/home/123.txt1 mean

KOA2 to achieve simple webpack-dev-server

KOA2 for easy Webpack-dev-server Thermal update Original HTTPS://GITHUB.COM/ZHUANGZHOU/BLOG/ISSUES/3 Idle to Nothing, with koa2 a simple webpack-dev-server, in fact, many online Express build hot update, but koa2 few; Welcome to the big guy to shoot bricks and enlighten;Source Configure the basic Webpack1. Download the installation package Webpack Webpack-cli Ht

On the ">/dev/null 2>&1" of shell

From: http://www.ixdba.net/a/os/linux/2010/0422/35.html "When reprinted, please indicate the source of the article and the author's information and this statement in the form of a hyperlink"Original link: http://www.ixdba.net/a/os/linux/2010/0422/35.html Today in one of their technical group was asked such a question, and then the popular explanation, make a record, we see whether the explanation is clear.The shell may often see: >/dev/nu

Data Analysis System DIY2/3: Local 64-bit Win7+dev C + + compiler operation VMware CENTOS7+MARIADB

Data Analysis system DIY three tasks to complete.First, use VMware to install 64-bit CentOS. The database service side with CentOS comes with the good.Second, data collection and pretreatment with dev-c++ programming solution.Third, using the local Win7 64 matlab r2012b Connection database for mining analysis.This article is the process of completing the second task.1.Terminal Enter the command line "Ifconfig" to confirm the CentOS virtual machine ip:

"Go language Tutorial" A Tour of Go 70 collection Golang

This is a creation in Article, where the information may have evolved or changed. http://www.aqee.net/go/a-tour-of-go/#5 "Go language Golang" A tour of Go: #1 Hello world!"Go language Tutorial" A Tour of Go: #2 Installing an offline Golang"Go language Tutorial" A Tour of Go: #3 package Golang"Go language Tutorial" A

Device "/dev/SDG" is not a partition [continued]

I summarized the error before creating an ASM Disk: http://blog.csdn.net/rhys_oracle/article/details/17029333 This is the case today. As follows: When you use openfiler to map to a local disk through iSCSI, the following error occurs when you create the entire disk as ASM: [[emailprotected] iscsi]# /etc/init.d/oracleasm createdisk VOL1 /dev/sdhMarking disk "VOL1" as an ASM disk: [FAILED][[emailprotected] iscsi]# tail -5 /var/log/oracleasm Cleanin

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