Shulou(Shulou.com)06/02 Report--

Preface

What is Linux?

Linux is a free-to-use and free-spread Unix-like operating system. It is a multi-user, multi-task, multi-threaded and multi-CPU operating system based on POSIX and Unix. It runs major Unix tools, applications, and network protocols. It supports 32 bit and 64 bit hardware. Linux inherits the design idea of Unix with network as the core, and is a multi-user network operating system with stable performance.

Features: free, reliable, secure, stable, multi-platform.

What is the Linux command?

The linux command is a command that manages the Linux system. For the Linux system, no matter the CPU, memory, disk drive, keyboard, mouse, or users are all files, the commands managed by the Linux system are the core of its normal operation, similar to the previous DOS commands. There are two types of linux commands on the system: the built-in Shell command and the Linux command.

1. Shell

A special program running in 1.Linux system

two。 Act as a "translator" before the user and kernel

3. When a user logs in to the Linux system, a shell program is automatically loaded

4.Bash is the default shell program used in Linux systems

The file is located in / bin/bash

Two Linux commands

Linux command classification

III. Linux command line format

General command line format: command word + [option] + [parameter]

Command word: operation + option: function + parameter

Auxiliary operation of Linux command line

Tab key: automatic completion

Backslash\: force line wrapping

Shortcut key Ctrl+U: clear to the beginning of the line

Shortcut key Ctrl+K: clear to the end of the line

Shortcut key Ctrl+L: clear the screen

Shortcut key Ctrl+C: cancel editing this command

Linux common commands

Help: view bash internal command help information

-- help: for most external commands

Man: read the man page

Arrow keys scroll the text; Page up and Page down turn the page; Q and Q exit; press "/" to find the content

Pwd: displays the location of the user's current working directory, and displays the absolute path, root directory

Cd: reach a destination directory

Cd ~: home directory

Cd -: change to the directory where you were last located

Cd.. Return to the upper directory

Cd../../: return to the upper directory

Cd / root directory

Ls: list displays directory contents

Ls+ [options] + files or directories

Ls-l: displays the details of the file

Ls-a: view hidden files

Ls-A view hidden files except. ..

Ls-d displays the information of this directory

Ls-h friendly form to display information with units

Ls-R recursive form

Distinguish file types by color

Black-data file

Blue-directories, folders

Red-compressed package

Green-execution files, command files, scripts

Sky Blue-linked files, shortcuts

Huang-device files, disk files

Set alias

Alias myls= "ls-alh"

Du carries on the statistics

Du-a statistics of all

Du-h friendly form has a unit

Du-s only counts the total size

Mkdir creates an empty directory

Soft links: shortcut

Hard links: aliases for fil

File node: a unique identification sequence of files stored on disk

Cp replication

Rm-f deletion

Which command | Program name or which-a command | Program name

Find+ Lookup range + Lookup conditional expression

Using recursive method, fine search is carried out according to different attributes such as name, type and size of the target.

Find-name, find-size, find-user, find-type

"- a" means and (and)

"- o" indicates or (or)

Summary

Learning Linux commands is a difficult hurdle for us, and the only trick is that we need to knock more and practice more before we can master it skillfully. This is the basis of our study, as long as we master the commands well, we can make better progress in the next study, otherwise we will come into contact with more and more orders in the future, if we do not absorb them well now, it will be more difficult to absorb them in the future. So we must practice more!

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