Linux

chmod: Change file 9 propertiesThere are two ways to set up Linux file attributes, one is a number and one is a symbol.Linux files have the basic permissions of nine, respectively, owner/group/others three identities each have their own

Linux system configuration and service management Application, server application-openstack Operating system Three necessary levels for-------------system applications Hardware

What is a regular: a string of regular stringsgrep: Filter The specified keyword format: grep [-cinvabc] ' word ' filename-C line number-I is case insensitive-N Display Line number-V Take reverse-R Traverse All subdirectories-A followed by a number

Centos7 Some simple operations after installation of the systemThe last time we completed CentOS7 through the virtual machine has been installed.After rebooting the system, enter the login screen.Once the system has landed successfully, it looks

Linux Modify time zoneshell # cp /usr/share/zoneinfo/Asia/Shanghai /etc/localtimeLinux Installation NTP time servershell # yum install ntp ntpdate -yshell # vim /etc/ntp.conf1）vim /etc/ntp.conf① 配置方法一：只允许192.168.100.0网段的客户机进行时间同步在restrict default

command to count the number of files:1) Count the number of files in the current folder　　Ls-l |grep "^-" |wc-l2) count the number of directories under the current folderLs-l |grep "^d" |wc-l3) Count the number of files in the current folder,

In the process of learning Linux, we will generally use virtual machines to build the Linux environment we need, because the system will die in various test situations, and the installation of the environment is a waste of time, on the virtual

#! /bin/bashPath=/usr/local[!-D "$path"] && mkdir $path-PCat 1.[install Lamp]2.[install LNMP]3.[exit]pls input the num you want:EndRead-p "Please input num:" numExpr num + 1 &>/dev/null[$?-ne 0] &&{echo "The num you input must is {1|2|3}"Exit

Linux Link ConceptsThere are two types of Linux links, one called hard links, and the other called Symbolic links (symbolic link). By default, the LN command produces a hard link."Hard Connect"A hard connection is a connection that is made through

Some of the commonly used shutdown/Restart commands under Linux are shutdown, halt, reboot, Poweroff, and Init, all of which can achieve the purpose of shutting down the system, but the internal working process of each command is different. Linux

Introduction to security alerts on GitHub Last month, we used dependency graphs to make it easier for you to track projects that your code depends on. It currently supports Javascript and Ruby. Today, over 75% of GitHub projects are dependent. We

Use sudo for authorization in Linux Learn how to grant the managed network functions and specific service permissions to trusted users while protecting the security of the root password. I recently wrote a brief Bash program to copy MP3 files from

Configure and use Maven in Eclipse Build a Maven development environment under Eclipse. Now we need to use Eclipse to develop Maven projects. We need to configure Maven in a simple way. 1. Download the Maven installation package. 2. If you directly

Create a sub-process execution task in Linux The Linux operating system depends on Process Creation to meet user needs. For example, if you enter a command, the shell process creates a new process, and the new process runs another copy of the shell

CentOS 7.4 Upgrade Linux Kernel Recently, intel has released two Meltdown and Spectre vulnerabilities that allow major service providers to perform system upgrades one after another. Therefore, we recently learned about Linux kernel upgrades.

Using snapper to easily play with the snapshot function of BtrfsI. Preface The outbreak of the WannaCry ransomware virus in early May 2017 made me aware of the importance of deploying storage snapshots, especially on servers that provide storage

Mysql adds the federated engine for dblink remote table access and federateddblink Check whether the mysql database federated engine is enabled. Show engines;If federated is not enabled, add federated to mysqld in mysql configuration file my. cnf.

Docker3.10 modify the default address and common docker commands, docker3.10docker How to modify the docker0 IP address of the docker default NIC:[Root @ centos7 ~] # Cat/etc/docker/daemon. json Add the following line to this file and restart the

CentOS, crontab learning, usage, and problem solving records, centoscrontab Reference: http://blog.csdn.net/luanwpp/article/details/7490871 Refer: Http://mp.weixin.qq.com? Src = 11 & timestamp = 1509778367 & ver = 493 & signature =

Docker Quick Start Guide Docker is developed using the Go language. It encapsulates and isolates processes based on Linux kernel cgroup, namespace, AUFS, and other technologies. It is an operating system-level virtualization technology. Because the