Linux

working principle:1, client looking for server: Broadcast send Discover packet, look for DHCP server2, the server responds to the request: the single advertisement sends the offer package, responds to the client. Provides client network-related

Disk structureNumber of sectors, tracks, cylinders and headsThe most basic part of the hard disk is made of hard metal materials coated with magnetic media, the number of different disk sizes. Each platter has two sides and can record information.

Here is said to compile the installation, Yum/apt-get and other installation methods are relatively simple, not elaborated!1. Download the source package: gcc.gnu.org2, decompression:TAR-XJVF gcc-4.9.0.tar.bz23 . Download the dependent packages

Note: The installation directory for the service is under/ETC/RC.D/INIT.D,/ETC/INIT.D is a link to/etc/rc.d/init.d.The Chkconfig command is used to install, view, or modify the settings of the startup options that the services boot with the system.

under Linux, there will be some configuration file parameter mismatch, root password forgotten and so on, causing the system to fail to start or enter the root of the distress situation, this article to Redhat Enterprise Linux Server 6.4 as an

General: First, using PS to view the process, the method is as follows: $ ps-ef......smx       1822     1  0 11:38?        00:00:49 Gnome-terminalsmx       1823  1822  0 11:38?        00:00:00 Gnome-pty-helpersmx       1824  1822  0 11:38 pts/0    00

Note: Because the debugging time minicom out a problem, the transfer of a larger file will fail, so the following program may be a bit of a problem, please note1.button.c#include #include #include #include #include #include #include #include

　　Data Flow re-orientation (redirect) in the literal sense, it seems that the "data is transmitted to him elsewhere" appearance? That's right. Data flow redirection is the data that should appear on the screen after a command is run and transmitted

File Lookup 1,which Find the executable file, which will only search the system $path directory 2,whereis, find the executable file, and display the file's man page file, and can find the system's library directory 3,locate and Slocat is the same,

The first type:01 If you want to change the default SSH port (22), then you just modify:/etc/ssh/sshd_config in Port 22, here to change the 22 to their own port to set the line, but do not set and now have the same port, oh, in case of unknown

OverviewSometimes the system administrator may only be concerned about which programs are running on the system and don't want to know which processes are running. Because an application may need to start multiple processes. So in the same situation,

Conversion of Deb format to RPM format in Linux environment Convert the Deb format to the RPM format using the Alien tool Alien_8.87.tar.gz Download alien_8.87.tar.gz [Email protected] ~]# wget

0. Study time2014-05-161. Command format　　NL [Parameter] file name (file name is also default, read from standard input)2. Command parameters　　-B t blank line no line number (default)-B A blank line also adds a line number (similar to cat-n)-N LN

NAMETput, reset-initialize a terminal or query Terminfo databaseSynopsisTput [-ttype] capname [parms ...]Tput [-ttype] Inittput [-ttype] ResetTput [-ttype] LongNameTput-s Tput-vDESCRIPTIONThe Tput utility uses the Terminfo database to make the

/proc/sys/vm/drop_caches (since Linux 2.6.16)Writing to this file causes the kernel to drop clean caches,Dentries and inodes from memory, causing the memory to becomeFree.To free Pagecache with use echo 1 >/proc/sys/vm/drop_caches; ToFree dentries

The first type: Use the command to modify (direct immediate effect, restart failure)#ifconfig eth0 192.168.0.1 netmask 255.255.255.0 upDescriptionEth0 is the first Nic, and the others are eth1,eth*192.168.0.1 is the IP address configured for the

I wrote a quick training material for my wife-the most common command and explanation. Of course, each person's work content is different, and Common commands are also different. This is only my personal experience and the basis of the recipient

In linux, some configuration file parameters may be wrong, and the root password may be forgotten, causing the system to fail to start or enter the root embarrassment, this document uses redhat enterprise linux server 6.4 as an example to describe

Common shutdown commands in linux include shutdown, halt, poweroff, and init. Restart Commands include reboot. The following describes some common shutdown commands and their differences and usage. First, let's take a look at some commonly used

The simulator is too slow, and the effect of running programs on the simulator is still a little different from that on the real machine after all. Therefore, we recommend that you use the real machine for debugging as much as possible. Connect your