Re-learn Python, learn python

Re-learn Python, learn python
Learning Resources

 

Virtual Machine tools:VMWare 12

Linux:Ubuntu 14 or CentOS 6

PS: how to set up a remote connection tool for ubuntu

Step 1: Enter sudo apt-get install openssh-server, provided that you have connected to the Internet.

Step 2: After the load is complete, the system will automatically install it. Check if the sshserver is started. Enter ps-e | grep ssh.

If sshd exists, it indicates that the startup is successful. If no, sudo/etc/init. d/ssh start

Client Connection Tool: xmanager or SecureCRT 8.0 (keys can be searched online)

How to install vmware tool: https://jingyan.baidu.com/album/3065b3b6e8dedabecff8a435.html? Picindex = 5

 

Root Directory Overview

 

Command for viewing the root directory

ls /

Or

ll /

Directory introduction:

/-> Root directory/boot-> boot configuration file, kernel and other files required for startup/etc-> store system configuration-related files/home-> store Common User Directories /mnt-> manually mounted file system on the hard disk/media-> automatically mounted hard disk partition/opt-> stores some users' installation software and files, general testing software is installed in this directory/root-> System Administrator directory/bin-> store common command files/sbin-> system management command/tmp-> temporary directory/usr -> General shared path

File System Default: ext4

 

Several Common commands

 Date: date command

1. query the usage of the date command

man date

2. modify the system time, but only the root permission can be modified.

date -s 20171112date -s 15:15:15

3. display a calendar

cal

 

Machine startup commands

Logout # logout shutdown # shutdown reboot # restart

 

Cd command

Cd/opt/# Go to the opt path cd-# Go To The last opened path cd .. # go back to the previous directory

 

Passwd

Passwd # modify the password of the current user

 

Touch

Touch test # create the test file touch test.txt notebook and create the test.txt File

Rm

Rm test.txt # DELETE command

Delete directory

Rm-rf directory # Delete non-empty directory, use rmdir with caution # Delete empty directory