Linux

Learn to use the Linux private dishes VI of Brother BirdThe VI compiler is preinstalled on Linux, which makes it easy to view and edit documents. Learning VI Learning the basics of Vim, VI has a lot of commands, need to practice memory use

1. Remove the Linux self-brought JDK (just to keep the system clean, or not to delete)The complete identity system has been deleted.2. Download the JDK and select the appropriate JDK version as neededWebsite address:

Recently, there is a business scenario needs, you have to put some of the user on the server to kick off, oh, nonsense not to say, methods have two1. First Use W(or who) to see who landed on the server:2. Below, we need to kick off the Caesar user

"LVM" What is LVM? LVM (Logical Volume Manager) Logical volume management, is a partition of one or more hard disks in a logical collection, equivalent to a large hard disk to use, when the hard disk space is not enough to use, you can

The importance of permissions to a file: (mainly for the contents of the file, no relation to the filename)R: The actual contents of this file can be read.W: You can edit, add, or modify the contents of the file (but not delete the file)X: The file

 Mpstat is a real-time system monitoring tool for Linux. Some statistical information about its report and CPU, which is stored in the/proc/stat file. In a multi-CPU system, it not only can view the average status information of all CPUs, but also

Compression packet compression method and decompression method for various suffixes Compress package Compression Extract . tar.gz and. tgz TAR-CZF jpg.tar.gz *.jpg TAR-XZVF filename-c Path

1. at--to perform a task at some point in the futureUsage examples: at time: Set a point in time At>command At>ctrl+d Specify time: Absolute Time: HH:MM,DD. Mm. Yy,mm/dd/yy relative Time: now+3minutes units: minutes, hours, days, weeks Blur time:

The Linux kernel can receive certain command-line options or boot-time parameters when it is started. You can manually pass these parameters to the kernel in such a way that the kernel does not recognize some hardware and cannot set hardware

Process Status View command:Ps:process State-O: Specify display fieldsThere are two styles of process status display:BSD Style: Non-additive when usedSYSV style: When use plus-BSD Style:A: Show all terminal-related processesU: Shows which user

1 Cdev Structural Bodystructcdev{structKobject Kobj;/*Inline Kobject Objects*/ 　　 structModule *owner;/*Owning Module*/ 　　 structFile_operations *ops;/*file operation structure Body*/ 　　 structList_head list; dev_t Dev; /*Device

The conversion of the IP of the string to the 32 IP说明 网络上的IP都是数字加点(192.168.0.1)构成struct in_addr结构使用32位的IP，如IP(C0A80001)是192.168.0.1int inet_aton(constcharstruct in_addr *inp)将a.b.c.d的IP转换为32位的IP，存储在 inp指针里面char *inet_ntoa(structin)

#include   #include   #include   #include   #include   #include   #include  # Include  #define  buffer_size 255#define server_port 13579#define  ligen_of_listen_queue 5int main (INTARGS,CHAR**ARGV) {//init socketint  servfd,clifd;struct sockaddr_in 

Today you need to delete the line breaks inside the file, such as a file a.txt:1,2,34,5,61,2,34,5,61,2,34,5,61,2,34,5,61,2,34,5,61. Use Vim to remove newline charactersVim input command:%s/\n//g2. Use SED commands, such as sed ': t; N;s/\n//;b T ' a.

First, the system level of Linux4 applications3 Library2 cores1 hardwareWhen running the program, the application is dispatched to the hardware execution by the kernel;Third, the user interface1 CLI Command PromptShell type: sh,csh,tcsh,bash,ksh,zsh2

　　[1] New source program SHARELIB.C1 /*************************************************************************2 > File name:sharelib.c3 > Author:copener4 > Mail: [email protected]5 > Created time:2015 May 14 Thursday 09:03 18 seconds6 *************

Thread PropertiesProperty values cannot be set directly and must be manipulated using related functionsThe initialization function is pthread_attr_init, and the function must be called before the Pthread_create functiontypedefstruct{ int

Thread Mutex mechanismA mutex variable is like a "lock", which is the primary way for thread synchronization and protection of shared dataMutexes can be used to prevent competitionThe basic concept of mutex in pthreadsAt any time, only one thread

Ubuntuvim Chinese garbled characters Add Chinese character encoding: $ Sudo vim/var/lib/locales/supported. d/local # Add the following Chinese Character Set Zh_CN.GBK GBK Zh_CN.GB2312 GB2312 Zh_CN.GB18030 GB18030 Make it take effect: $ Sudo

Disable and enable ping on Linux servers Modify/proc/sys/net/ipv4/icmp_echo_ignore_all to 1. Disable ping from 0. Sysctl-w net. ipv4.icmp _ echo_ignore_all = 1. Another method is iptables-based ping. Iptables-a input-p icmp -- icmp-type 8-s 0