In this guide, we will create a bash command that generates random  file names within a folder. Although generating random strings, we will encode a random number generated using the **$RANDOM** variable with base64.


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## Generate Random Names For Text Files Using Bash Command

Before proceeding with the code snippet, let's examine each bash command that will be utilized to create random file names.

- **for file in path/to/folder**  => For iterating in a folder
- **if-fi**  => For checking a file's extension
- **mv**  => For changing a file's name

```
for file in /Users/john/Desktop/bash/*
do
  if [ ${file##*.} = 'txt' ];
  then
     RANDOM_HASH=`echo $RANDOM | base64`
     mv "$file" "/Users/john/Desktop/bash/$RANDOM_HASH.txt"
  fi
done
```
In short, this command will iterate over files given path with a for loop and check if current file's extension is txt, if so, it will generate a random string and change  file names in current folder.

Make sure you give absolute path for folder by obtaining with the **pwd** command in your bash  before running the bash file, because you don't want to harm your files. In addition to this you can configure the command above by changing the required extension or random string generation method.

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## Conclusion

In this article, we have created a bash command using a for loop and if-else conditionals to generate random file names in a directory. If you run the command above in a directory, it will be rename all files with random string.

Thank you for reading.


Create a linux bash command to generate random filenames for files such as text, pdf, etc in a directory.

Linux Bash Command to Generate Random FileName

You can improve the security of your remote Linux servers by disabling authentication with the root user and creating a new user to connect to the server. Before beginning, please note that this article will not cover generating a new SSH key. Ensure that you already have an SSH key and a connection to the server as the root user.

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## Connect To Your Linux Server With Root User


```bash
ssh root@your-ip-address
```

## Create New User

When you run the following command, you will be asked to provide a password and extra informations, so follow the instructions on your terminal.

```bash
adduser your-new-user-name
```
## Add  New User To Sudo Group To Give  Sudo Privileges

**sudo** is a special group that have grant to execute command  on your server without needing root user, so add your new user this group.

```bash
usermod -aG sudo  your-new-user-name
```

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## Introduce  New User To Your Local Machine

Your local device doesn't regocnize the new user, so go to your local terminal and copy your public ssh key manually.


```bash
cat ~/.ssh/id_rsa.pub
```

## Create .ssh File To Add Your SSH Key To Linux Server

On your remote linux server, switch the users and create a file to save ssh key copied on your local machine. 

```bash
-- Switch Users
su your-new-user-name
```


```bash
-- Create a file to store the public ssh key.
sudo mkdir ~/.ssh
```

```bash
-- Open the file and paste your SSH key you copied in your local machine.
sudo nano ~/.ssh/authorized_keys
```

After pasting the ssh key, press control X, type y and press enter to save. Now you are able to connect to the server with root and the new user. But let's take a look at how to disable root login.

## Configure Your SSH Settings In Ubuntu Linux Server


```bash
-- Connect with the root user to the server
ssh root@your-ip-address
```

```bash
-- Open the config file in edit mode and set no to PermitRootLogin
nano /etc/ssh/sshd_config 
```

![disable-root-login.png](https://api.onjsdev.com/uploads/disable_root_login_2a8451247f.png)

## Restart SSHD Service


```bash
service sshd restart
```

## Test Your SSH Connection To Ubuntu Linux Server 

### - With Root User

Now you can test connecting to the server with the root user from different terminal. You should receive the following message.

![root-login-denied.png](https://api.onjsdev.com/uploads/root_login_denied_b992decfaa.png)

### - With New User


```bash
ssh your-new-user-name@your-ip-address
```
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## Conclusion

In this article we have shown how to disable the root user login and create a new user to connect to the remote linux server for improving the server's security.

Thank you for reading

Add a new user and disable SSH root login on Linux Ubuntu to improve security of your server

Linux Bash Command to Generate Random FileName

Disable SSH Root Login On Linux Server