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Build basic script When creating a shell script, you must specify the shell to be used in the first line of the file. Its format is: #!/bin/bash environment variable Example: #!/bin/bash #display user information from the system echo "User info for userid: $USER" echo UID: $UID echo HOME: $HOME User variable The user variable can be any ...

Firewall firewall policy details 1, Firewall firewalld Firewall is Centos7 The default firewall management tool of the system replaces the previous one iptables In the firewall layer, packet filtering also belongs to the network. firewalld and iptables are tools used to manage firewalls (in user mode) to define various rules and functions o ...

1, Preparatory work 1. Download SDK 4.0 of hongruan face recognition value-added version 1) Register and log in to the developer center 2) Download hongsoft face recognition SDK 2. Install Unity3D and Visual Studio 2019 development environment 1) Install Unity Hub 2) Install Unity 2020.3.1f1c1 2, Create DEMO project 1. Create Unity proj ...

1, Background es comes with a lot of word splitters, such as standard, whitespace, language (such as english), but they are not very good for Chinese word segmentation. A third-party word splitter ik is installed here to realize word segmentation. 2, Install ik word splitter 1. Find the word breaker matching this es version from github # Do ...

catalogue 1, APT introduction 2, Supply mode of APT source 3, Local APT source 1. Use the DEB package of the CD as the APT source 2. The file source list is used as the system installation source 3. View profile 4. Update repository index 4, Network APT source 1. Backup profile 2. Write configuration file 1) Aliyuan (ubuntu 16.04) 2 ...

Primary directory Secondary directory Tertiary directory 1. Pipeline 1. Anonymous pipeline Anonymous pipes communicate with blood related processes Anonymous pipeline communication steps: 1. A process opens the same file in read-write mode respectively, so there are two file descriptors, one pointing to the file in read mode and th ...

Author: michelangela young, preacher KubeSphere, cloud native severely infected On January 18, 2022, Linux maintainers and vendors in the legacy of Linux kernel (5.1-rc1 +) file system context function_ parse_ An error was found in the param function Heap Buffer Overflow Vulnerability with ID number CVE-2022-0185 , which is a high-risk vulne ...

Length of string The syntax for obtaining the length of a string is as follows. ${#varname} Here is an example. $ myPath=/home/cam/book/long.file.name $ echo ${#myPath} 29 Braces {} are required, otherwise Bash will interpret $# as the number of script parameters and variable names as text. $ echo $#myvar 0myvar In the above example, ...

As a school with insufficient funds, the infrastructure of our school is relatively backward. There are more than 100 machines in the computer room for students, but the total bandwidth of the Internet is still only 10Mb. Some students saw that I was using Manjaro and were interested in learning Manjaro, but found that the installation of softw ...

When using linux, the rm -rf command is often executed, but this command is risky. For example, execute a shell script, which contains the following statements: # script.sh rm -rf $HOME/$SOME_PATH At this time, if the environment variable HOME is caused by a setting_ If the path is empty, all contents in the HOME directory will be cleared di ...