Linux

Depressed, the previous writing was not saved, and I had to write it again ......   A few days ago, I wrote an article about wifi.ArticleSome WiFi driver debugging tools are introduced in detail. problems occurred during the debugging of

UnrmHttp://packetstormsecurity.com/UNIX/utilities/unrm-0.92.tar.gzA small tool actually uses the debugfs command in Linux, which simplifies the steps for manual use of debugfs,There is no interactive interface, and the recovered files are directly

This series of articles provides some personal notes on the Unix toolbox.System Running kernel and system information: # Uname-#Obtain the kernel version (and BSD Version) # Lsb_release-#Display any LSB release version information #

Transferred from:Http://www.cnblogs.com/helloBreak/archive/2011/09/03/2165897.htmlMethod 1: To 3 Characters [root@15 system]# rm -rf /etc/systemd/system/default.target[root@15 system]# ln -s /lib/systemd/system/runlevel3.target

Virtual box is a highly popular open-source Virtual Machine Software with powerful functions. Articles about it are everywhere on the Internet.   Virtual box was installed in WINXP some time ago, and then Linux was installed in virtual box (Linux is

In Linux these two days, YUV videos are collected using v4l2 and then encoded as H.264 files. I saved the YUV video to a file and used the pyuv player to play it. The tragedy was that the video screen was played. As follows: The parameters for

Abstract Linux boot process, including BIOS power-on self-check post, copy MBR information (start bootloader), load kernel, if you are familiar with grub when mounting the root file security system, you will know that there are three grub types at

Http://hohoqi.blog.163.com/blog/static/10795561201091011199438/ FindFind is a very effective tool that can traverse the current directory or even the entire file system to find some files or directories. Main options:-name Search for files by file

TCP requires ACK, but for efficiency, instead of waiting for ACK every time a piece of data is sent, it tries its best to use the window mechanism to accumulate ack sending, of course, in some special circumstances, Ack still needs to be sent

I. brigde -- bridging: vmnet0 is used by default. Fish annotation: You only need to set the IP address in the VM to allow communication even if the IP address of the host is incorrect. However, if the physical network card is disabled, communication

1. x switching between winsows and text mode ● [CTRL] + [alt] + [F1] ~ [F6]: text interface to log on to tty1 ~ Tty6 terminal.● [CTRL] + [alt] + [F7]: graphic interface desktop. In the two login modes of Linux, a logon environment with only plain

I. Load average1.1: What is load? What is load average?Load is the measure of how much the computer is working (Wikipedia: The system load is a measure of the amount of work that a compute system is doing)Simply put, it is the length of the process

Linux boot process analysis and grub boot program Boot is simple for each of us. But what process does it take to start the entire boot process? Generally, the Linux boot process follows the following steps: 1. Load BIOS hardware information,

Seven: I2C Dev node operation now to analyze the above structural diagram of the i2c-dev.c in part. this section provides an adapter operation interface for the user space. this part of the code is actually a module. its initialization function is:

Finally, we read all the code in the uboot phase. The general feeling is that the uboot code is really clever. Reading good code is like reading a good book, reading it repeatedly, thinking carefully, and summarizing it in time. This is the

1. What is sysfs?"Sysfs is a ram-based filesystem initially based on ramfs. It provides a meansTo export kernel data structures, their attributes, and the linkages between them to userspace. "--sysfs.txtA virtual memory-based File System,In addition

  1. Linux kernel Startup Process OverviewAn embedded Linux system can be divided into four parts: Boot Loader, Linux kernel, file system, and application. Bootloader is the first code executed after the system is started or reset. It is mainly used

1. Linux time1.1 Linux Time System1.2. Time-related data structure in Linux 2. Obtain the current time 3. latency 4. Timer4.1. Alarm4.2. setitimer 1Linux time1.1 Linux Time SystemUNIX and Linux time systems start from epoch (the beginning of the

Recently, I encountered the following code in terms of kernel exposure: Struct list_head {struct list_head * Next, * Prev; // bidirectional linked list}; # define list_head_init (name) {& (name), & (name)} # define list_head (name) \ struct

In short, Max-file indicates the number of file handles that can be opened at the system level, while ulimit-N controls the number of file handles that can be opened at the process level. MAN 5 proc, find the file-Max explanation: File-Max