beginner

What is a Ruby gem?

A Ruby gem is a packaged library or tool that you can add to your Ruby programs to use extra features without writing them yourself.

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beginner

What command do you use to install a gem?

You use gem install gem_name to download and install a gem on your system.

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intermediate

How do you install a specific version of a gem?

Use gem install gem_name -v 'version_number' to install that exact version.

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beginner

What does the gem list command do?

It shows all the gems currently installed on your system.

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intermediate

Why might you need to use sudo with gem install?

Because installing gems system-wide may require administrator rights, so sudo gives permission to install.

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Which command installs the 'rails' gem?

Agem install rails

Binstall gem rails

Crails gem install

Dgem rails install

How do you check which gems are installed on your system?

Agem show

Bgem check

Cgem list

Dgem status

What option installs version 2.1.0 of a gem named 'nokogiri'?

Agem install nokogiri --version 2.1.0

Bgem install nokogiri -v '2.1.0'

Cgem install nokogiri version 2.1.0

Dgem install nokogiri v2.1.0

Why might you need to run sudo gem install?

ATo get administrator permission for system-wide gem installation

BTo speed up the installation

CTo uninstall gems

DTo update Ruby itself

What happens if you run gem install without a gem name?

AIt updates Ruby

BIt installs all available gems

CIt lists installed gems

DIt shows an error asking for a gem name

Explain how to install a Ruby gem and check if it is installed.

Describe why you might need to use sudo when installing gems and how to install a specific version.