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Linux Tools

This is a collection about various Linux tools.

Table of Contents

Tor Browser

The Tor Browser is a internet browser that allows users to surf the web anonymously (If used the right way). It also gives you access to the dark web.

Tor Browser can be installed very easily by using apt.

Open a terminal, then run the following commands:

sudo apt update
sudo apt install -y tor torbrowser-launcher

After the process completes, run the following command as non-root user:

torbrowser-launcher

The first time, it will download and install Tor Browser, including the signature verification. Next time, it will be used to update and launch Tor Browser.

⚠️Warning: It is true that you are more anonymous when using the Tor Browser instead of a normal browser like Chrome or Firefox.

But to be even more secure and anonymous while browsing the web with Tor Browser, get a good and secure VPN. A good VPN will encrypt your data and hide your IP address as well. The possibility of being tracked will be very low and hard to accomplish.

Secure Shell Protocol (SSH)

What is SSH

SSH also known as Secure Shell, is a network protocol that gives users, a secure way to access a computer over an unsecured network. SSH provides strong password authentication and public key verification, as well as encrypted data communication between two computers connecting over an open network.

Secure Shell was created to replace insecure terminal emulation or login programs, such as Telnet and rsh (remote shell). SSH enables the same functions, like logging in to and running terminal sessions on remote systems. SSH also replaces file transfer programs, such as File Transfer Protocol (FTP) and rcp (remote copy).

The most basic use of SSH is to connect to a remote host for a terminal session. The command for that would be

ssh UserName@server.example.com

This command will establish a connection between the local host and the server, the user will be prompted with the remote host's public key fingerprint

The authentication of host 'sample.ssh.com' cannot be established.
ECDSA key fingerprint is SHA256:fIeOO+66eOvuFtoF54z4UT7gS3oTTbrO0sxfxvhzBHw.
Are you sure you want to continue connecting (yes/no)?

If you answer with yes, the session will continue and the host key is stored in a file called known_hosts. This file is located in your home directory and can be found in ~/.ssh/known_hosts. Once the key has been stored in the known_hosts file, the client can connect directly to that server again, without the need for any approvals.

What are SSH keys

SSH keys are comparable to a very long password. SSH keys always come as a pair, and every pair is made up of a private and public key. If you want to connect to an SSH server, the private key will remain on the host machine and will be used to decrypt information that is exchanged over the SSH protocol.

⚠️Warning: Private keys should always be handled securely - i.e. the system is fully encrypted and the private key is secured with a passphrase.

The public key is used to encrypt information, it can be shared, and is used by the user as well as by the server. The key will be stored in an authorized_keys file on the server, which can contain a list of authorized public keys. The file is usually located in ~/.ssh/authorized_keys.

If you want to setup SSH keys, check the configure public key authentication section.

Visual Studio Code

Visual Studio Code is a free, powerful code editor that runs on every machine.

Screen

Screen is a terminal multiplexer. In other words, it means that you can start a screen session and then open any number of windows (virtual terminals) inside that session. Processes running in Screen will continue to run when their window is not visible, even if you get disconnected.

Install Screen

You can install Screen by using the apt manager

sudo apt update
sudo apt install screen

Start Screen

To start a Screen session, simply type screen in your terminal. Now that you have a screen session open, you can get a list of commands by typing:

Ctrl + a (Shift) ?

Start Named Session

You can as well start a named session, for example if you are running multiple screen sessions. To create a named session:

screen -S session_name

Useful Screen Commands

💡Tip: You can use man to see a detailed documentation about screen.

To create a new window with shell

Ctrl + a + c

To list all windows

Ctrl + a + "

Switch to a window

Ctrl + a + 0..9

Rename a current window

Ctrl + a + A

Window splitting

Split current region horizontally into two regions

Ctrl + a + S

Split current region vertically into two regions

Ctrl + a + |

Switch the input focus to the next regions

Ctrl + a + Tab

Toggle between the current and previous windows

Ctrl + a Ctrl + a

Close all regions except the current one

Ctrl + a + Q

Close the current region

Ctrl + a + X

Detach from Screen session

You can detach from a screen session anytime by typing

Ctrl + a + d

The program running in the screen session will continue to run after you detach from the session.

Reattach to a Screen session

To resume your screen session, use the following command

screen -r

If you have multiple screen sessions running on your machine, you will need to append the screen session ID after the r switch.

To find the session ID, list the current running screen sessions with

screen -ls

The output will look like this

user@hostname:~# screen -ls
There are screens on:
        20131.pts-0.hostname    (05/30/2022 12:43:27 AM)    (Detached)
        29062.pts-0.hostname    (05/30/2022 12:41:46 AM)    (Detached)
2 Sockets in /run/screen/S-root.

If you want to restore screen 29062.pts-0, then type the following command

screen -r 29062

Sherlock

Sherlock is a python tool, that uses a username to find social media accounts across various social networks.

Install Sherlock

Sherlock can be installed very easily by using the following commands:

Clone the official repository into a desired location first:

git clone https://github.com/sherlock-project/sherlock.git

After that, change the working directory to sherlock:

cd sherlock

💡Info: You may need to install python3 and pip first, before you can install the necessary requirements:

Update your system:

apt update

Then install python3 and pip:

apt install python3
apt install python3-pip

The last step is installing the python requirements:

python3 -m pip install -r requirements.txt

Sherlock Usage

A detailed description about all possible arguments Sherlock provides can be looked up with:

python3 sherlock --help

And on the official GitHub repository.

To search only for one user:

python3 sherlock user123

To search for more than one user:

python3 sherlock user1 user2 user3 ...

If accounts are found, they will be stored in an individual text file with the corresponding username (e.g. user1.txt, user2.txt).