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How to Use SSH on Linux?

If you are a Linux user, you have probably heard of SSH. SSH, or Secure Shell, is a network protocol that allows you to securely connect to a remote machine over an unsecured network. SSH is a powerful tool that can be used to administer remote servers, transfer files, and even tunnel network traffic. In this article, we will discuss how to use SSH on Linux.

Prerequisites
Before we begin, you should have access to a Linux machine with SSH installed. You will also need the IP address or hostname of the remote machine you want to connect to. If you don't know the IP address or hostname, you can use the ping command to find it.

Step 1: Open the Terminal

To use SSH, you will need to open a terminal on your Linux machine. You can do this by clicking on the terminal icon in your desktop environment, or by pressing Ctrl+Alt+T.

Step 2: Connect to the Remote Machine

To connect to a remote machine using SSH, you will need to use the ssh command. The basic syntax of the ssh command is as follows:

ssh [username]@[hostname or IP address]

For example, if your username is johndoe and you want to connect to a machine with the IP address 192.168.1.100, you would run the following command:

ssh johndoe@192.168.1.100

If this is the first time you are connecting to the remote machine, you will be prompted to add the machine's key to your list of known hosts. Type yes to add the key.

Step 3: Enter Your Password

After you have successfully connected to the remote machine, you will be prompted to enter your password. Enter your password and press Enter. Note that your password will not be visible as you type it.

Step 4: Use SSH on the Remote Machine

Once you have successfully authenticated with the remote machine, you can use SSH to administer the machine, transfer files, or tunnel network traffic. To exit the SSH session and return to your local machine, type exit and press Enter.

More Examples

Here are a few more examples of how you can use SSH on Linux:

  1. Transfer a file from your local machine to a remote machine using SCP:
scp /path/to/local/file.txt johndoe@192.168.1.100:/path/to/remote/directory
  1. Connect to a remote machine using a different port:
ssh -p 2222 johndoe@192.168.1.100
  1. Create an SSH tunnel to access a remote database:
ssh -L 3306:localhost:3306 johndoe@192.168.1.100

SSH is a powerful tool that can be used to securely connect to remote machines and perform a wide variety of tasks. By following the steps outlined in this article, you should now have a basic understanding of how to use SSH on Linux.

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  • That's it for this post. Keep practicing and have fun. Leave your comments if any.

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