Linux

0. PrefaceThis blog is only used to record a small tool used by the individual in the work, followed by other supplements.1. TmuxTerminal Splitter (multiplexer), you can create multiple terminals on one screen, and this tool can also be used for

Some common shutdown/Restart commands under Linux are shutdown, halt, reboot, and Init, all of which can be used to reboot the system, but each command has a different internal working process.Linux CentOS Restart command:1, reboot2. shutdown-r now

System: Contos 5.5Function: Timed from the network to a more accurate timeUsage: There are several ways to update the time, here is a simple introduction to the Rdate commandThe system usually comes with the rdate command at the time of installation,

1, modify the Linux time can try the date commandThe function of the date command is to display and set the system time and date.Enter date to view the current system time:2. Date of modification:The order of the time set to September 6, 2015 is as

Six months ago, I wrote, "How does a computer start?" To explore the role of BIOS and master boot records.The article does not cover the operating system and is only relevant to the Board's onboard program. Today, I would like to write down and

1. See if the installation# Rpm-qa | grep vsftpd2. New Installation# RPM-IVH vsftpd-2.0.1-5.i386.rpm3. Start/Stop/restart# service VSFTPD Start# Service VSFTPD Stop# Service VSFTPD Restart4. master configuration file# vi/etc/vsftpd.conf# Anonymous

Knowledge Reserve Permission model For a file, Linux defines 3 different permissions for 3 types of objects; Class 3 objects: Master U, Group G, Other O 3 Permissions: Read permission r,

(1) First, save the host IP you want to transfer to a file VI IP10.161.4.x10.161.4.x10.161.4.x (2) scripting#!/usr/bin/kshUsername=tomcat # Here is the user name for connecting to the remote host, as in this case the

IntroductionMost of the IO statistics tools under Linux, such as Iostat, Nmon, and so on, are only counted to the Per Device's read and write situations, and if you want to know how each process uses IO, it's a bit cumbersome.Iotop is a top class

Question one: see which process is consuming which port, and kill the process1. View occupied ports: sudo lsof-i: 80lsof command is the meaning of list open filesLike what:lsof filename Displays all processes that open the specified fileLsof-i used

The history commands in Linux are generally saved in the user???? /root/.bash_historyHistory Options Historical Command Save folderOptions???? -C: Empty history command???? -W: Write History command in cache to history command to save

File permissions and user groupsGroupadd Group NameGroupadd PolicemanView GroupsVi/etc/groupCat/etc/groupCreate a user and specify which group to assign the user toUSERADD-G Group name User nameView all user information in

RpmRPM is a very useful package management Manager in Linux, it has the functions of installing, uninstalling, upgrading, querying, verifying, database maintaining and so on.Here are the various features of RPM:Installation:RPM {-i|--install}

CentOS installation program:AnacondaTui Text Installation InterfaceGUI Graphical Installation InterfaceCentOS Installer startup process:CD MBR:boot.catStage2:1) isolinux/isolinux.bin (boot loader)2) configuration file: Isolinux/isolinux.bin3)

Advanced parts of Bash variables1. Variable expansion${variable name} variable extension for example: ${filename}$ (command) command replacement for example: $ (LS/)$ (arithmetic) calculation extension for example: $ ((9+9))Variable extension: A

How to make non-root User Programs in Linux use ports smaller than 1024   In Linux, ports lower than 1024 can be used only under root by default. If you try to use ports below, an error is returned. Sometimes, we may consider running the program

Summary of Tmux and tcpdump in Linux 0. Preface This blog is only used to record a small tool used by an individual at work. It will be used later. 1. Tmux Multiplexer allows you to create multiple terminals on one screen. This tool can also be used

Use LVM on Ubuntu to easily adjust partitions and create snapshots The Ubuntu installer provides a check box to easily "use LVM. In its description, enabling logical volume management allows you to create snapshots and easily adjust the size of

Solve the Problem of modifying locale in Ubuntu This article is aimed at the problem of "Ubuntu installation Chinese Language Pack" "Ubuntu Server Chinese problems", "Ubuntu change language environment", "Ubuntu locale settings", "cannot change

Case study of slow Linux SSH LogonIt takes dozens of seconds to log on to a Linux server over ssh. No such problem occurs on other servers. At ordinary times, the login operation was intolerable. Today, I finally cannot help wondering why. I