Programming VIP

1. Introduction to shell 1. Configuration requirements: OS: RHEL7 or CentOS8 is recommended CentOS8 will stop maintenance at the end of 2021 RHEL8 or dragon lizard operating system https://openanolis.cn 2. Classification of Shell Scripting Language There are two kinds of shells: Bourne shell and C shell Bourne shell includes Bourne s ...

View and read permissions I Permission view ls -l file view file permissions ls -ld dir view directory permissions II Understanding permissions File permission information Directory permission information $: explanation for each digit [1] File type -Ordinary file d catalogue l Soft connection b Fast equipment c Character device s sock ...

S h e l l Shell Shell Scripting Language Tutorial 2 2 2 Copyright: Jingmin Wei, Pattern ...

Cron timed task expression manual Cron expression is applied in Unix and Unix like operating systems to make scripts and tasks execute periodically and repeatedly. Cron expression has poor and rich expression ability and can meet various time expression needs. This page arranges some basic grammar and common examples for your reference. Basic ...

Fundamentals of shell programming (shell script learning notes) loop In Shell programming, it is often necessary to repeatedly execute one or a group of commands, such as printing 10 "Hello World" continuously - although writing 10 echo "Hello World" instead of loop can also complete the same work, but what if printi ...

The following shell commands are gitbash installed on windows can execute successfully. The single and double quotation marks under linux may be different. Common basic commands Commands: let let command is a tool for calculation in BASH, which is used to execute one or more expressions. It is not necessary to add $to represent vari ...

1. Definition of variables A variable is the address of an area of memory Meaning of variables The command cannot manipulate the value that changes all the time. Using a fixed string of characters to represent an unfixed target can solve this problem 2. Variable definition method in shell script Environment level: the variable becomes invalid a ...

We often use command-line tools in front-end development, such as @babel/cli,vue-cli,create-react-app wait. So how to create an npm command line tool? In fact, it's very simple. It only takes a few steps. establish 1 initialize npm project npm init package name: (cli) gogocode-cli version: (1.0.0) description: my-first-cli entry point: (ind ...

preface What is a Linux Shell Linux Shell is the interface program between users and Linux kernel, which provides users with an excuse to use the operating system. When a command is passed to the Linux kernel, it will respond. Shell is a user program, or an environment provided for user and system interaction. It is a language interpreter ...

Virtue wins talent, which is called a gentleman; Talent wins virtue, which is called a villain—— "Zizhi Tongjian · Tang Ji" I Antecedents - reduce duplication of effort Previously, when deploying the running environment of development software in ubuntu, it was necessary to copy and paste the contents in differe ...