RVM, which stands for Ruby Version Manager, is a tool used to manage multiple Ruby environments on a single machine. It allows you to easily switch between different versions of Ruby and install gems without affecting the system Ruby installation. RVM is an essential tool for developers and system administrators working with Ruby applications.

In the Linux environment, RVM provides a convenient way to manage Ruby environments without interfering with the system packages. It allows you to isolate your Ruby projects and easily switch between different versions of Ruby for each project. This ensures that your projects have the necessary dependencies and can run on the required Ruby version.

To install RVM on Linux, follow these steps:

1. Open a terminal window.

2. Update your package manager's cache by running the following command:

   sudo apt update

3. Install the dependencies required by RVM:

   sudo apt install curl gpg

4. Import the RVM GPG key by running the following command:

   gpg --keyserver hkp://keys.gnupg.net --recv-keys 409B6B1796C275462A1703113804BB82D39DC0E3 7D2BAF1CF37B13E2069D6956105BD0E739499BDB

5. Install RVM by running the following command:

   \curl -sSL https://get.rvm.io | bash -s stable

6. Close and reopen the terminal window to load RVM.

Once RVM is installed, you can use it to manage your Ruby environments. Here are some common commands:

• To install a specific version of Ruby, use the following command:

  rvm install ruby_version

  Replace "ruby_version" with the desired version of Ruby, such as "2.7.4".

• To switch to a specific Ruby version, use the following command:

  rvm use ruby_version

  Replace "ruby_version" with the version of Ruby you want to use.

• To list all installed Ruby versions, use the following command:

  rvm list

• To set a default Ruby version for new terminals, use the following command:

  rvm use ruby_version --default

  Replace "ruby_version" with the desired default Ruby version.

RVM provides many more features and options for managing Ruby environments. You can explore them by referring to the official RVM documentation.