Linux

Linux VI: vi a. Java; I; ESC;:; WQ/Q! ; Grep (search in text, find is the search file, and history shows the CMD you executed) File class: Pwd; LS; mkdir/rmdir; touch (create an empty file ); CP = copy; more/less (displayed by PAGE); CD; Path

Q: How can I find out which service is listening on a specific port? How can I find one?ProgramListening on a specific port? A: In * nix, you can use any of the following commands to obtain a list of listeners on a specific TCP port. Lsof: Lists

Linux time zone and time modificationModify the time zone:1>Find the corresponding time zone file/usr/share/zoneinfo/Asia/ShanghaiReplace the current/etc/localtime file with this file.Or find the server that you think is the standard time, and then#

The common solution to this problem on the internet is (mainly to modify the configuration file/etc/ssh/sshd_config ):     My system is centos 5.3, SSH connection is very slow, it is Intranet, It is very slow and unbearable, basically it takes

Careful friends will notice that when you areLinuxAfter files are frequently accessed, the physical memory will soon be used up. When the program ends, the memory will not be released normally, but will always be used as caching. it seems that many

1. Search for processes PS is the command used to view processes in Linux: [Syntax]: PS [-EFL] [-T grouping table] [-u User table] [-G group table][Note]: displays the status of related processes. 1) pS A shows all programs under the current

# Zip-rp abc #123 test.zip test.txt -P abc #123 is the encrypted password. -R recursion: all files and subdirectories in the specified directory are processed together.Test.zip is the generated compressed file.Test.txt is the compressed file. Zip

    LVS (Linux virtual server) Linux virtual server (LVS) is designed to meet the needs of highly scalable and highly available network services. It provides a load balancing scheduling solution based on the IP layer and content request distribution,

Functions of kconfig in Linux Kernel 2.6 The source code tree directory of the kernel generally contains two texts: kconfig and makefile. Kconfig distributed in various directories forms a distributed Kernel configuration database. Each kconfig

Transferred from "Cu ": 1. Su -Root: Enter the root password. 2. type the REDHAT-CONFIG-PRINTER, press enter, and appear (figure 1) If you configure it for the first time, the following box will be blank, without this default printer. 3. Click "new"

  The combination of a dot followed directly by a forward slash (. /) is often used to precede commands in Linux and other UNIX-like operating systems. although this requirement can seem confusing and even tedious to new users, it exists for good

Due to work needs, we have recently developed such a server-side program. Strictly speaking, this program is not a server program for normal chat. It is a Broadcast Server processor in a game system. However, you only need to make some modifications

SCP usage in Linux SCP is secure copy, a command used to remotely copy files in Linux. Sometimes we need to obtain a file on the remote server. This server is neither configured with an FTP server nor shared. When files cannot be obtained through

Various IT companies recruit Linux programmers. There are three links: 1. network:. system Administrator; B. web development engineer; 2. embedded Development: mainly development of mobile phones and development of video devices and other electronic

In recent days, a project needs to share memory between the user layer and the kernel. In the previous blogs, we found kernel2.4. The pain points of change during implementation. Only the kernel source code can be handled. Later on this site (http://

# Include # Include # Include # Include # Include # Include # Include # Include # Include # Define my_file "/root/logfile" Char Buf [128];Struct file * file = NULL; Static int _ init Init (void){Mm_segment_t old_fs;Printk ("Hello, I'm the

4.2 Data Transmission Flowchart Description of main functions and locations of each layer: 1) sock_write: Initialize msghdr {} structure net/socket. C 2) sock_sendmsg: net/socket. C 3) inet_sendmsg: net/IPv4/af_net.c 4) tcp_sendmsg: Apply for a

4.3 Data receiving Flowchart Description of main functions and positions of each layer: 1) sock_read: Initialize msghdr {}'s structure type variable MSG, and pass the address of the data to be received to MSG. msg_iov-> iov_base. net/socket. C 2)

Waiting queue in Linux KernelThe waiting queue of Linux kernel is based on the double-loop linked list and closely integrates with the process scheduling mechanism to implement the core asynchronous event notification mechanism. In linux2.4.21, the

Address: http://madbluesky.iteye.com/blog/738337 Linux awk command details  Awk Introduction0. awk has three different versions: awk, nawk, and gawk. It is generally gawk.1. The most basic function of the awk language is to extract information based