Linux

In linux, the general idea of configuring and connecting to a wlan wireless network card through command line is as follows: Use iwconfig to enable the power of the wireless network card, and find the wireless network in the region to connect to the

An important task of Linux kernel memory management is how to avoid fragments when memory is frequently applied for release. Linux uses the partner system to solve external fragments and slab to solve internal fragments. Here we will first discuss

In linux, ifconfig is a command used to display or configure network devices. Syntax ifconfig [network device] [down up-allmulti-arp-promisc] [add ] [del ] [] [media ] [mem_start ] [metric ] [mtu ] [netmask ] [tunnel ] [-broadcast ] [-pointopoint ]

First, connect the network cable. 1. Open the application menu, and select accessories-terminal. 2. Enter sudo pppoeconf in the pop-up terminal window and press Enter. 3. You will be prompted to enter the password of the current Ubuntu administrator

Common compression and decompression commands in linux and aix are usually compressed and decompressed. The command output is usually compressed and the command output is 1.gzip *. gz format (gzip, gunzip) compression (only files can be compressed

High-availability Web site configuration for nginx + keepalived in CentOS, support for Rewrite and a series of other software products has become the preferred software for websites. At the same time, the biggest feature of Nginx is its own load

Linux-2.6.35 kernel Transplantation -- transplantation of Nand flash Driver Nand flash is the most common external storage device in embedded systems. Here we introduce the transplantation process of Nand flash Driver. A, porting environment: 1,

Time is used for timing. dd is used for copying, reading from if, and writing to. If =/dev/zero does not produce IO, so it can be used to test the pure write speed. Similarly, of =/dev/null does not generate IO and can be used to test the pure read

Awk usage: awk 'pattern' {action} 'variable name meaning ARGC command line variable number ARGV command line variable element array FILENAME current input file name FNR current file record number FS input domain separator, default is a space RS

Go deep into linux for redirection and pipeline details 1. Redirect 1.1 redirection symbols> redirect output to a file or device to overwrite the original file>! Redirect output to a file or device to forcibly overwrite the original file> redirect

Author: Cao jianghua With the expansion of Linux applications, many friends have started to access Linux. Based on Windwos learning experience, they often feel a bit confused: they do not know where to start learning. Here are some suggestions for

1. man provides help explanations for familiar or unfamiliar commandsFor example: man ls, you can view the ls-related usage.Note: Press q or ctrl + c to exit. in linux, you can use ctrl + c to terminate the current program. 2. ls view the directory

With the rapid expansion of bandwidth, information exchange on the Internet is increasing, and there is no doubt that the security of the Internet and operating system platform have gradually become a concern. Many network servers and workstations

Source: 51 CTOFirst, no program can ensure permanent security of your network or server. Security is a continuous process of continuous improvement, evaluation, and improvement. Fortunately, there are many good tools in linux to help you in this

Author: linyin (linyin.8800.org)Source:Linyin blog.Implementation environment:# Uname-OpenBSD linyin.8800.org 4.3 GENERIC. MP #0 i386#/Usr/local/sbin/openvpn -- versionOpenVPN 2.0.9 i386-unknown-openbsd4.3 [SSL] [LZO] built on Nov 11 2008Developed

I am about to become a senior vice president. linux started to contact me two years ago. Now I think that I am not a qualified operator. My goal is to truly learn how to work efficiently in linux. I want to talk about my views on linux learning from

About partitions If a potential hacker attempts to attack your Linux server, he will first try Buffer Overflow. In the past few years, buffer overflow is the most common form of security vulnerabilities. More seriously, the buffer overflow

5. Sealed The Kernel We need to do some necessary operations when the system is started, but we also need to protect them when the system is running. For example, we need to insert some required modules in the kernel, but we do not want to insert

  First, execute the Command Script on each node. Mkdir-p ~ /. Ssh Chmod 700 ~ /. Ssh /Usr/bin/ssh-keygen-t rsa Then on the host that needs to be distributed in batches Touch ~ /. Ssh/authorized_keys Ssh 192.168.1.20 cat ~ /. Ssh/id_rsa.pub> ~ /.

  You are familiar with sys-unconfig. It is convenient for new users to use it most. The disadvantage is that you need to change all configurations once and restart the machine. You may have to go to the data center: 1. Back up the current/etc/inet/