Linux

Single-User mode System restart command: Reboot init 6 shutdown-r now Shutdown command: Init 0 poweroff Operating level: 0-6 [[email protected] ~]# ls-l/usr/lib/systemd/system/runlevel*targetlrwxrwxrwx. 1 root root 15 May 28 18:4

1) Managing documents from the command line on a Linux hostLS, cat, mkdir, Touch, CP, RM, MV2) Create/modify system files from the command lineVim3) Manage user/group accounts from the command lineExercise 1: Browse directories and files1. View the

system environment for this change operation: Centos7.2The procedure is as follows:1: Modify/etc/udev/rules.d/90-eno-fix.rulesVim/etc/udev/rules.d/90-eno-fix.rules# This file is automatically generated on SYSTEMD updatesubsystem== "NET", action==

With these two instructions, you can: Getfacl: Get ACL settings for a file Setfacl: Setting ACL Specification for a file [[email protected] ~]# setfacl [-BKRD] [{-m|-x} ACL parameter] file parameter:-M: Set ACL permissions, cannot be

First, view the system loadW/uptime Viewing system loadLoad average refers to the system running in a minute, five minutes, 15 minutes, on average how many services are runningLoad value is greater than the number of logical CPUs indicates overload,

10.15 iptables Filter Table small casevim/usr/local/sbin/iptables.sh#!/bin/bashipt= "/usr/sbin/iptables"$ipt-F$ipt-P INPUT DROP$ipt-P OUTPUT ACCEPT$ipt-P FORWARD ACCEPT$ipt-A input-m State--state related,established-j ACCEPT$ipt-A input-s 192.168.104

Linux Utility Commands 1, More Page page to view ( down one ' space ', prev 'b', exit 'q' ) Example:moreSend.log2, less page to view ( the next page ' space ', the previous page ' B ', exit ' Q ', go up one line '?') , down one line '?')3, tail-1

10.1 W View System load监控系统的状态 w / uptime 查看系统负载 cat /proc/cpuinfo 查看CPU核心数 vmstat 监控系统状态 用法 vmstat 1 关键的几列：r , b , swpd , si , so , bi , bo , us , wa top 查看进程使用资源情况 top -c 显示详细的进程信息 q 退出，数字1显示所有核CPU，大写字母 M 按内存使用排序 大写字母 P

Drwxr-xr-x->>d represents the meaning of the data directory file->> for a file or directory, there are: Read, write, execute three kinds of permissions.R Read cat more tail less hard ...W Write VI mkdir RM touch CP MV ...X Execute script, CDLetter

Section 2 Department - Important directory structure detailed1.Review Linux directory structure knowledge/dev/Equipment Catalog/etc/System Configuration and service profile, starting the directory of commands/proc virtual file system showing kernel

Use Iftop on Linux to view network usage, use Iotop to view disk IO usageFirst you need to install Iftop and iotop:Yum Install IftopYum Install Iotop=====================================================================================================

1,  installationNTPyum-y Install NTP (Direct Yum installation can be)2 , Modify The configuration of the ntp.conf1 ) vim/etc/ntp.conf① Configuration method One: only allow The client of the 192.168.100.0 network segment to synchronize timein the

System busBus for CPU memoryService Background ServiceInteractive programsProtection modePrivileged mode0---"1---" 2---"3Areas in protected modeBIOS Mapper---"Loading the operating systemShellInterfaceGUI: Image User InterfaceCLI: Command Line

SVN user and permission configuration tutorial on Linux, linuxsvn 2.1 create a repository 2.1.1 create a warehouse storage directory # Mkdir-p/opt/svn/{repos, etc} 2.1.2 create an SVN Repository # Svnadmin create/opt/svn/repos/source1 # Svnadmin

How to Use grep in linux and grep in linux 1. grep-E "addFavStation Query data that contains "addFavStation" or "favorite coupon parameters :" 2. grep "SinochemController" web-info.log.2018-03-18 | grep "collection successful, coupon delivery

Basic concepts of Linux device models (I): basic concepts of linux 1. Device Model Introduction The Linux 2.6 kernel initially proposed a device model to manage all the devices to cope with power management needs. Physically, there is a

Basic Attributes of Linux Files and basic attributes of linux Files Linux is a typical multi-user system. Different users are in different positions and have different permissions. To protect the security of the system, Linux requires different

Introduction to linux processes, ports, and service commandsProcess commands 1. View running processes: how to view all running processes in Linux 2. Killing processes: N methods to kill processes in linux Note: This command is often used in

Linux Command usage introduction-less command, linux Command introduction-less The less tool is also a paging display tool for files or other outputs. It should be said that it is an orthodox linux tool for viewing file content and has extremely

Some Problems and Solutions for ubuntu remote connection 1. to remotely connect to a linux host on the Windows platform, download the remote connection client on the window, such as SSH, SecureCRT, and putty. 2. What is important about this is that