Post Closed as "Duplicate of…" by Ohnana, Deer Hunter, Xander, woliveirajr, Dmitry Grigoryev of
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Like all beginners in the land of Linux, I usually look for websites that contain some useful shell commands, mark it with my mouse, copy it (CTRL + C) and paste it into a terminal.

For example, if I need to install package_name.deb

sudo apt-get install package_name.deb

I will give my root password and install the package_name.deb

When I paste this command to my text editor, it will be something like:

sudo apt-get install package_name.deb && apt-get install suspicious_file.deb 

Second example, if I want to add a new ppa (terminal)

sudo add-apt-repository ppa:some/ppa
sudo apt-get update

When I edit my sources.list, I will find something like:

deb http://ppa.launchpad.net/some-ppa/

and

deb http://ppa.launchpad.net/a_suspicious_some-ppa/

The problem is the second ppa deb http://ppa.launchpad.net/a_suspicious_some-ppa/ is added automatically and without my permission.

As you can see, there is an invisible part. It does not appear on my terminal.

What is the risk of copy and paste from an untrusted website in the terminal and how to fix my operating system?

Like all beginners in the land of Linux, I usually look for websites that contain some useful shell commands, mark it with my mouse, copy it (CTRL + C) and paste it into a terminal.

For example, if I need to install package_name.deb

sudo apt-get install package_name.deb

I will give my root password and install the package_name.deb

When I paste this command to my text editor, it will be something like:

sudo apt-get install package_name.deb && apt-get install suspicious_file.deb 

Second example, if I want to add a new ppa (terminal)

sudo add-apt-repository ppa:some/ppa
sudo apt-get update

When I edit my sources.list, I will find something like:

deb http://ppa.launchpad.net/some-ppa/

and

deb http://ppa.launchpad.net/a_suspicious_some-ppa/

The problem is the second ppa deb http://ppa.launchpad.net/a_suspicious_some-ppa/ is added automatically and without my permission.

As you can see, there is an invisible part. It does not appear on my terminal.

What is the risk of copy and paste from an untrusted website in the terminal?

Like all beginners in the land of Linux, I usually look for websites that contain some useful shell commands, mark it with my mouse, copy it (CTRL + C) and paste it into a terminal.

For example, if I need to install package_name.deb

sudo apt-get install package_name.deb

I will give my root password and install the package_name.deb

When I paste this command to my text editor, it will be something like:

sudo apt-get install package_name.deb && apt-get install suspicious_file.deb 

Second example, if I want to add a new ppa (terminal)

sudo add-apt-repository ppa:some/ppa
sudo apt-get update

When I edit my sources.list, I will find something like:

deb http://ppa.launchpad.net/some-ppa/

and

deb http://ppa.launchpad.net/a_suspicious_some-ppa/

The problem is the second ppa deb http://ppa.launchpad.net/a_suspicious_some-ppa/ is added automatically and without my permission.

As you can see, there is an invisible part. It does not appear on my terminal.

What is the risk of copy and paste from an untrusted website in the terminal and how to fix my operating system?

6 copy-editing, removed second question that invalidated other answers
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Like all beginners in the Landland of linuxLinux, I usually look for websites that contain Some Usefulsome useful shell commands, mark it with my mouse, copy it (CTRLCTRL + CC) and paste it into a terminal.

For example i, if I need to install package_name.deb

sudo apt-get install package_name.deb

iI will give my root password and install the package_name.deb

When i pastI paste this command to my text editor, it will be something like:

sudo apt-get install package_name.deb && apt-get install suspicious_file.deb 

Second example :

i will, if I want to add a new ppa (terminal)

sudo add-apt-repository ppa:some/ppa
sudo apt-get update

when iWhen I edit my sources.list i, I will find something like:

deb http://ppa.launchpad.net/some-ppa/

and

 deb http://ppa.launchpad.net/a_suspicious_some-ppa/

The problem is the second ppa deb http://ppa.launchpad.net/a_suspicious_some-ppa/ is added automatically and without my permission.

As you can see, there is an invisible part,. It does not appear on my terminal.

1)WhatWhat is the risk of copy and pastpaste from an untrusted website in the terminal?

After runing the tow commands there are a serious problem with my OS

2)How to repair and fix my operating systems if they are infected with some malware?  

Like all beginners in the Land of linux, I usually look for websites that contain Some Useful shell commands, mark it with my mouse, copy it (CTRL + C) and paste it into a terminal.

For example i need to install package_name.deb

sudo apt-get install package_name.deb

i will give my root password and install the package_name.deb

When i past this command to my text editor it will be something like:

sudo apt-get install package_name.deb && apt-get install suspicious_file.deb 

Second example :

i will add a new ppa (terminal)

sudo add-apt-repository ppa:some/ppa
sudo apt-get update

when i edit my sources.list i will find something like:

deb http://ppa.launchpad.net/some-ppa/

and

 deb http://ppa.launchpad.net/a_suspicious_some-ppa/

The problem is the second ppa deb http://ppa.launchpad.net/a_suspicious_some-ppa/ is added automatically and without my permission

As you can see, there is an invisible part, It does not appear on my terminal.

1)What is the risk of copy and past from an untrusted website in the terminal?

After runing the tow commands there are a serious problem with my OS

2)How to repair and fix my operating systems if they are infected with some malware?  

Like all beginners in the land of Linux, I usually look for websites that contain some useful shell commands, mark it with my mouse, copy it (CTRL + C) and paste it into a terminal.

For example, if I need to install package_name.deb

sudo apt-get install package_name.deb

I will give my root password and install the package_name.deb

When I paste this command to my text editor, it will be something like:

sudo apt-get install package_name.deb && apt-get install suspicious_file.deb 

Second example, if I want to add a new ppa (terminal)

sudo add-apt-repository ppa:some/ppa
sudo apt-get update

When I edit my sources.list, I will find something like:

deb http://ppa.launchpad.net/some-ppa/

and

deb http://ppa.launchpad.net/a_suspicious_some-ppa/

The problem is the second ppa deb http://ppa.launchpad.net/a_suspicious_some-ppa/ is added automatically and without my permission.

As you can see, there is an invisible part. It does not appear on my terminal.

What is the risk of copy and paste from an untrusted website in the terminal?

5 added 92 characters in body
source | link

Like all beginners in the Land of linux, I usually look for websites that contain Some Useful shell commands, mark it with my mouse, copy it (CTRL + C) and paste it into a terminal.

For example i need to install package_name.deb

sudo apt-get install package_name.deb

i will give my root password and install the package_name.deb

When i past this command to my text editor it will be something like:

sudo apt-get install package_name.deb && apt-get install suspicious_file.deb 

Second example :

i will add a new ppa (terminal)

sudo add-apt-repository ppa:some/ppa
sudo apt-get update

when i edit my sources.list i will find something like:

deb http://ppa.launchpad.net/some-ppa/

and

 deb http://ppa.launchpad.net/a_suspicious_some-ppa/

The problem is the second ppa deb http://ppa.launchpad.net/a_suspicious_some-ppa/ is added automatically and without my permission

As you can see, there is an invisible part, It does not appear on my terminal.

What1)What is the risk of copy and past from an untrusted website in the terminal? How

After runing the tow commands there are a serious problem with my OS

2)How to repair and fix my operating systems if they are infected with some malware? 

Like all beginners in the Land of linux, I usually look for websites that contain Some Useful shell commands, mark it with my mouse, copy it (CTRL + C) and paste it into a terminal.

For example i need to install package_name.deb

sudo apt-get install package_name.deb

i will give my root password and install the package_name.deb

When i past this command to my text editor it will be something like:

sudo apt-get install package_name.deb && apt-get install suspicious_file.deb 

Second example :

i will add a new ppa (terminal)

sudo add-apt-repository ppa:some/ppa
sudo apt-get update

when i edit my sources.list i will find something like:

deb http://ppa.launchpad.net/some-ppa/

and

 deb http://ppa.launchpad.net/a_suspicious_some-ppa/

The problem is the second ppa deb http://ppa.launchpad.net/a_suspicious_some-ppa/ is added automatically and without my permission

As you can see, there is an invisible part, It does not appear on my terminal.

What is the risk of copy and past from an untrusted website in the terminal? How to repair operating systems if they are infected with some malware?

Like all beginners in the Land of linux, I usually look for websites that contain Some Useful shell commands, mark it with my mouse, copy it (CTRL + C) and paste it into a terminal.

For example i need to install package_name.deb

sudo apt-get install package_name.deb

i will give my root password and install the package_name.deb

When i past this command to my text editor it will be something like:

sudo apt-get install package_name.deb && apt-get install suspicious_file.deb 

Second example :

i will add a new ppa (terminal)

sudo add-apt-repository ppa:some/ppa
sudo apt-get update

when i edit my sources.list i will find something like:

deb http://ppa.launchpad.net/some-ppa/

and

 deb http://ppa.launchpad.net/a_suspicious_some-ppa/

The problem is the second ppa deb http://ppa.launchpad.net/a_suspicious_some-ppa/ is added automatically and without my permission

As you can see, there is an invisible part, It does not appear on my terminal.

1)What is the risk of copy and past from an untrusted website in the terminal?

After runing the tow commands there are a serious problem with my OS

2)How to repair and fix my operating systems if they are infected with some malware? 

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