Linux

Recently, a company's server was maliciously added some timer tasks to the crond configuration file "/var/spool/cron/root, in this case, you only need to simply use the crontab-e command to remove the malicious task. However, after the modification,

In Linux Kernel Parameter Adjustment, there are several parameters that can be adjusted. For example, you can use netstat to findThe number of time-Wait instances is as follows:Netstat-AE | grep 1521 | grep Root View: VI/etc/sysctl. confWe can see

In Linux, there are usually two methods to speed up the network: iptables and TC, or combine them.1. The simplest way From: http://bbs.chinaunix.net/thread-833575-1-1.html The maximum upload speed of 192.168.0.2 is 30kb/s:Iptables-a forward-s 1

I just saw someone discussing whether to learn Linux or wince. I just added an article to my favorites.ArticleFor details, refer... In fact, learning is not important. Learning well is fundamental. I hope the following will help you make a

1. Change the file or directory permission chmod U + R G-W O = rwxR = 4, W = 2, x = 1+ Add permissions-Remove Permissions= Direct authorizationUse the root user identity to create a new directory with the permission rwxr-XR-X. Create a new file,

The Linux pmap command allows you to conveniently view the memory used by a process. The descriptions are as follows:1 pmap-D process numberMeanings of several columnsThe meaning of each column is as follows:Parameter descriptionAddress: address

Opensuse 11.4-2.6.37.1-1.2 @ x64 successfully passed   # Include # include # include # include # include # include void str_ser (INT sockfd); int main (void) {int sockfd = 0; int con_fd = 0; int new_fd = 0; int numbytes = 0; int ret = 0; int

Qemu tutorialQemu can work on Linux, windows, FreeBSD, and Apple systems. you don't have to worry about support. because it does not have a UI interface, it is purely a command line operation. Compared with virtual platform software such as VMWare,

The ID field of the IP header is used to identify different packets (instead of fragments, all parts of a packet have the same ID) This field only occupies 16 bits, so it will be quickly bypassed on a fast network, which may cause confusion in IP

Method 1, There are two files to be downloaded: zhcon-0.2.5.tar.gzand zhcon-0.2.5-to-0.2.6.diff.gz.: Http://sourceforge.net/project/showfiles.php? Group_id = 27400Windows download (first decompress WinRAR to get two files):

1: Host fun: host can be used to query domain names, but it can get more information. Host-t mx linux.com can query the MX record of linux.com and the Host Name of the mail processing host. Host-l linux.com returns all domain names registered under

1. What is INIT? 　　Init is an indispensable program in Linux. Is a user-level process started by the kernel. After the kernel is started (it has been loaded into the memory, started to run, and initialized to all the device drivers and data

The embedded Linux Network guides the development of embedded Linux. During kernel transplantation and root file system establishment, the establishment of the root file system is feasible to verify whether kernel transplantation is successful, they

In Linux, The getch () mechanism seems to have to press enter to capture the pressed keys, but because I want to press keypad without entering keys, so I have been stuck there with a program that was originally stored in DOS. It was very simple to

Suppose there are two Linux servers A and B. Log on to B from a through SSH.The console interface of server a is as follows:A @ A: SSH-keygen-T RSAA @ A: SSH-copy-ID-D ~ /. Ssh/id_rsa.pud B @192.168.2.5 B: The account used to log on to server B.

// XK> Introduction First, let's look at a simple interview question: Define a macro find (stru, e) to find the offset of a member e in the stru structure to stru. The answer to the question is simple: #define FIND(stru, e) &(((stru

Directly paste the Code:  # Define max_net_cards 16 /* local loopback interface name */ # define loopback_if_name "Lo" bool getnicinfoforlinux () { int skfd =-1, if_cnt = 0, if_idx = 0; struct ifreq if_buf [max_net_cards]; struct ifconf IFC;

@page { size: 21cm 29.7cm; margin: 2cm }P { margin-bottom: 0.21cm }--> Install the latest gcc4.2.2 in Linux Very simple. First of all, the latest package GCC 4.2.bz2 is usually available everywhere. The download speed in Linux is very full, more

If you need to temporarily become the system default path, you can do this: Export Path =/usr/local/ARM/bin: $ path Assume that the path to be added is usr/local/ARM/bin. Remember, the executable file is located under bin. For example, the

Enable hard disk DMA support. After the system is installed, the hard disk DMA is not enabled./Etc/rc. d/RC. add a line/sbin/hdparm-D1-C3-M16/dev/hda at the end of local. Note: my hard disk is SDA, the DMA of the hard disk is enabled without manual