You tried to install a gem using gem install sinatra but got an error saying command not found: gem. What is the most likely cause?

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Ruby - Gems and Bundler

You tried to install a gem using gem install sinatra but got an error saying command not found: gem. What is the most likely cause?

AThe gem name 'sinatra' is misspelled.

BThe gem is already installed, so it cannot be installed again.

CYou need to use <code>ruby gem install sinatra</code> instead.

DYou ran the command inside Ruby code instead of the terminal.

Step-by-Step Solution

Solution:

Step 1: Understand the error message
The error command not found: gem means the system does not recognize the gem command where it was run.
Step 2: Identify correct usage context
gem install must be run in the terminal (command line), not inside Ruby code or IRB.
Final Answer:
You ran the command inside Ruby code instead of the terminal. -> Option D
Quick Check:
Run gem commands in terminal, not Ruby code [OK]

Quick Trick: Run gem commands in terminal, not inside Ruby scripts [OK]

Common Mistakes:

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