Linux

Reads a row from the standard input and sends the value of each field in the input row to the specified shell variable.If more than one data is entered, the first data is given to the first variable, the second one to the second variable, and if the

#!/bin/shHostname= ' Hostname-s 'echo "==============hostname================"echo "Hostname= $HOSTNAME"Memoryline= ' Free | grep Mem '#字符串转数组Memoryarr= ($MEMORYLINE)echo "==============memory=================="TOTAL=${MEMORYARR[1]}USED=${MEMORYARR[2

One, the Linux system file tree-like structure"/" root directory"." Current directory.. Parent directory, both up-level directoryPWD Displays the current directory pathLs. = ls = ls/displays folders, files in the current directoryTAB Auto-CompleteLs-

CD (change directory) Open Directory LS view current directory under File ls-l list current directory details file information pwd display path name CD. Go back to the beginning of the previous level directory-the file D is a folder ls-a show hidden

$ ls-l/bin/bash-rwxr-xr-x 1 root wheel 430540 Dec 18:27/bin/bash The first character in the field (-) specifies the type of the file, in this case it is a regular file. Other possible first characters are: "D" directory "L" symbolic link "C"

Read Catalogue 1. Check if the system has a JDK installed 2. Preparatory work 3. Configure Environment variables 4. Verify that the installation is successful Back to top 1. Check if the system has a JDK installed1. Open

Loading process for files such as LINUX/ETC/PROFILE,BASHRC and setting of environment variablesReprinted: 69367215Environment variables are typically set in the profile file, If you only want this login shell to be valid, enter it directly in

View Timecal : Displays the current date.Cal 2018 : Displays the year-round calendar. / cal-y Displays the current year calendar.Date : Displays the current time.These few generally do not use to understand.viewing process informationPS : Displays

Hello everyone my name is Liugen, from Henan Xinyang, Xinyang is a different place Oh!!!We are there is a beautiful place where we eat rice very rarely eat pasta most people's mind is that Henan eat steamed bread and the like I graduated from our

Differences between Centos6 and 7, and between Centos6 1. init system The Linux operating system starts from the BIOS and then enters the boot loader. the bootloader loads the kernel and initializes the kernel. The last step of kernel Initialization

Linux basics, Reading directory Main Content Unit 1 installation and related configuration of Linux Unit 2 UNIX and Linux operating system overview Unit 3 Linux commands and help Unit 4 directory file browsing, Management and Maintenance (1)

Linux serial port user space programming and linux serial port space programming Open the serial port: Fd = open (dev, O_RDWR | O_NOCTTY | O_NONBLOCK) Set attributes: # Include // In the compiler, struct termios newtio; newtio. c_cflag | =

Linux redis configuration tutorial, linuxredis Redis-cli-h 127.0.0.1-p 6379? [-A passwprd] [-n database] set cli1 1? ? ---- Cli Command Execution# RDB Save 900 1 # When one Keys data is changed, refresh to Disk in 900 seconds. save 300 10 # When 10

Configure NFS sharing to share files between linux and linux. nfslinux Configure NFS sharing to share files between linux and linux. This article uses two virtual machines to simulate Use one of them as the client and one as the service

Jdk 1.8 installation tutorial in centos7, centos7jdk 1. Download the installation package jdk-8u11-linux-x64.tar.gz of jdk1.8 for linux 2. Uninstall the openjdk originally provided by centos and run the command: rpm-qa | grep java. Then, run

Linux user and group management commands, linux user commandsUseradd command The useradd command is used to create a new user in the format of useradd [Option] username. Parameters Function -D Specify the user's home

Centos7 system redis installation tutorial, centos7redis 1. Download Redis Use wget to download. I downloaded version 3.0.4. 2. Decompress Redis # tar -xzvf redis-3.0.4.tar.gz 3. Compile and install RedisSwitch to the program directory and run the

Advantages of Linux and Linux People familiar with computers know that Linux has many advantages over Windows, so now more and more computer users are using Linux for office and study. In general, Linux has the following advantages.1. open source

Memcached service,Introduction It is a data cache system or software. This function is used to cache database data in a dynamic application system to reduce database access pressure and improve performance. In actual application environments, it is

Kubernetes Data Persistence Solution Before introducing k8s persistent storage, we need to understand the mechanisms and uses of k8s emptydir, hostpath, configmap, and secret. 1. EmptydirEmptyDir is an empty directory. its lifecycle is exactly the