install ruby on ubuntu

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rbenv is a Ruby version manager that allows you to install multiple versions of Ruby and switch between them. Follow the steps below to install Ruby using rbenv.

Install all required dependencies for the ruby-build plugin to download and compile Ruby.

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$ sudo apt install autoconf patch build-essential rustc libssl-dev libyaml-dev libreadline6-dev zlib1g-dev libgmp-dev libncurses5-dev libffi-dev libgdbm6 libgdbm-dev libdb-dev libtool uuid-dev
Install the latest rbenv installation script.

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$ curl -fsSL https://github.com/rbenv/rbenv-installer/raw/HEAD/bin/rbenv-installer | bash
Add the rbenv path to the .bashrc file.

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$ echo 'export PATH="$HOME/.rbenv/bin:$PATH"' >> ~/.bashrc
Reload the .bashrc shell configuration to apply the path changes in your active session.

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$ source ~/.bashrc
View the installed rbenv version.

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$ rbenv -v
Your output should be similar to the one below.

rbenv 1.3.0-9-gefeab7f
List all available Ruby versions you can install.

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$ rbenv install -l
Note the target Ruby version in your output similar to the one below.

3.1.6
3.2.6
3.3.6
jruby-9.4.9.0
mruby-3.3.0
picoruby-3.0.0
truffleruby-24.1.1
truffleruby+graalvm-24.1.1

Only latest stable releases for each Ruby implementation are shown.
Use `rbenv install --list-all' to show all local versions.
Install your target Ruby version. For example, 3.3.6.

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$ rbenv install 3.3.6
The installation process may take 3-5 minutes to complete depending on the available server resources.

Set the installed Ruby version as the default if the installation is successful.

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$ rbenv global 3.3.6
View the installed Ruby version.

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$ ruby --version
Your output should be similar to the one below.

ruby 3.3.6 (2024-11-05 revision 75015d4c1f) [x86_64-linux]