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yum stay Linux The main function of is software management ： Install the uninstall . In my use centos 7 in , It's not just yum install , There are also source code installation and rpm Package installation .

Source code installation ： It needs to be compiled by users themselves , so much trouble

rpm Package installation ： What is installed is what , Many of these plug-ins also need to be found by yourself , It's a lot of trouble

Only yum Installation is the most simple and convenient , In this note yum Subject to .

yum uninstall

yum remove  Package name

With sl Command as an example , function sl ：

I've installed sl 了 , Show me how to uninstall first ：

yum install

yum install  Package name

install sl Command as an example ：

Conditions for us to install other people's software ：

We need someone else to compile the code into an executable program first ;

And put the compiled software where we can download it .

On mobile phone ：

It's like us mobile phone Upper Application market , You can search the corresponding software , Download the corresponding software , The application market will access the corresponding Company servers , Provide users with download function

stay Linux On ：

We are users , It's using Linux machine , Equivalent to a mobile phone ,yum Equivalent to the application market , One more Linux The server , Provide download function

Check out the package

adopt yum list The command can list which software packages are currently available . The number of packages is very large ：
For easy search , We usually need to use grep The command only filters out the packages we focus on ：
yum list | grep  Package name 

install lrzsz

yum install lrzsz

lrzsz Can be windows Drag the file under to Linux Next , You can also use rz command , Make a selection ：

2.vim Use

First let's install vim,-y Is to skip asking , Direct installation

yum install -y vim

vim It's an editor , Can only be used to write code , The reason for using it is that it is a multimodal editor , Powerful , Now let's take a look at the basic operations commonly used .

Get into / sign out vim

Editor , There must be editing objects , Create a .c file , The entry operation is as follows ：

If you quit Press shift + ： Enter bottom line mode , You can enter the command at the bottom , Input q that will do ：

Mode switch

Get into The text defaults to command mode , Cannot write text in it , Now we can Press i key , Enter insertion mode , Do text editing ：

In each mode, there will be corresponding letters in the lower left corner , As shown in the figure above .

If you enter the bottom line mode , I want to return to the command mode , According to the same esc Press the key ; Bottom line mode and insert mode cannot be switched directly , Must go through command mode .

Text batch operation in command mode

Copy and paste

y Press two times. --yy, Can copy this line
Numbers +yy Copy many lines
p It's paste , By default, it is pasted on the next line of the cursor
Numbers +p Is how many lines to paste
dd It's shearing Numbers +dd Cut multiple rows
u Is to undo the operation just now
ctrl + r Yes u Operation to undo

Positioning operation

vim Sliding is not supported , Under large text ：
shift+g ： Position the cursor at the end of the text
gg Position the cursor at the beginning of the text
Numbers +shift+g： Position the cursor on the specified line
shift+4： Position the cursor at the end of the line
shift+6： The cursor is positioned at the beginning of the line
w and b： Move the cursor forward and backward with words
h、j、k、l ： Move left 、 Move down 、 Move upward 、 Move right

Replace operation

shift+ ~：(esc below ) Case substitution
r ： Replace the character where the cursor is 、 Numbers +r： Replace multiple characters
shift+r： Batch replacement ( Override operation )
x： Delete the character at the cursor position 、 Numbers +x： Batch deletion

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