Linux

1,BC Simple Calculator2,[ctrl]+d End of File3,~ represents the user's home folder, which is a variable root's home folder in/root4,sync writes the In-memory data to the hard disk, usually steps before shutting down, good habit5,nano Simple and

1. Concept of interruptionInterrupts are essentially a special kind of electrical signal that is sent from a hardware device to a processor. Once the processor receives the interrupt, it immediately reflects the arrival of the signal to the

The Vmstat command is the most common Linux/unix monitoring tool that can show the status of a server at a given time interval, including server CPU utilization, memory usage, virtual memory exchange, IO Read and write situations. This command is I

##### Bulk Deployment SSH private key authentication #####First, install expect, direct Yum canSecond, bulk deploy SSH private key

chmod----Changing the access mode of one or more files (mode)chmod [options] mode filesThis feature can only be used by a file owner or a privileged user to change the file access mode. Mode can be expressed in digital form or in the form of who

Install and crack SmartSVN in Linux, and crack linuxsmartsvn Reposted from: Install smartsvn on the svn graphical client in linux I. PreparationSmartsvn requires java support. First, check whether java is installed on the machine. Also, check

View login users in CentOS Use the linux last command: The last command lists the content of the wtmp file in the/var/log directory. This file stores binary content and cannot be opened directly using text boundary software such as vi. in this

Delete unnecessary kernel after Centos update Today, my friend opened a virtual machine on his server to play with me. I told him to install Centos 7.0. Yum update-y, which is the habit of getting it, is a tragedy .. I don't know if I was restarted

CentOS settings allow winscp to log on directly with root Root Login/etc/ssh/sshd_config PermitRootLogin Solve the Problem of logging on to SSH before su-Logon: By default, it is safe to log on to SSH as a common user and then log on to the root

Kali Linux virtualbox rc = 1908 error Solution Kali Linux virtualbox rc = 1908 error Solution When I try to start virtualbox, the following message is displayed: Kernel driver not installed (rc =-1908)The VirtualBox Linux kernel driver (vboxdrv) is

Matching Relationship Between ActiveMQ5.11.1 and JDK versions Environment: MyEclipse2015 + ActiveMQ5.11.1 Different JDK versions may have different performance when running Java application. 1. JDK version jdk1.5/J2SE-1.5 Error: Java. lang.

Linux regular expression-Wildcard Wildcard metacharacters or periods (.) are considered to be equivalent to variables. A variable represents any value in an arithmetic expression. In a regular expression, a period (.) is a wildcard representing any

Ubuntu environment variable configuration file Ubuntu usually uses the following configuration files: /Etc/environment,/etc/profile,/etc/bash. bashrc ,~ /. Profile ,~ /. Bashrc Differences between them: ①/Etc/environment This file is the first

Linux learning --- boot script in centos Centos boot script To install jdk in cenos, you must configure environment variables: 1. Write the statement directly to/etc/profile. 2. Write the statement into a java. sh file and put the file in

Detailed description of commonly used linuxvi commandsI. move the cursorJ. Move a row down;K. Move a row up;H: move one character to the left;L move one character to the right;Ctrl + B Move the screen up;Ctrl + f move one screen down;$ Move to the

Modify specified columns in awk An error occurred while handling text files. Cat test.txt "355356" "1700870" "1" "0202 """"355356" "1700871" "2" 02046""355356" "1700870" 2 "" 02046""1700870" "1700873" 1 "" 0202"Change the data of 2nd columns to 17008

Linux-(18) Linux File SystemAll hardware devices in Linux are abstracted as files and stored in the/dev directory. The disk is no exception.The disk name is generally hd [~ Z] or sd [~ Z], "~ Z is the disk number, the first disk is a, and the second

Linux host mutual trust Configure ssh mutual trust in linux What is linux host mutual trust: Linux host mutual trust means mutual trust between hosts. What is trust? Just like between people, you don't need to use money or anything other than

Linux-(20) Linux File System (2)The operating system manages files and data through the file system. A disk or partition needs to be created before it can be used by the operating system. The process of creating a file system is what we often call

[Blog recommendations] Linux Enterprise O & M efficiency tips and sharing (1) This blog post is from the blog of Bkjia blogger Wu guangke. If you have any questions, please visit the blog homepage for an interactive discussion! Blog