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Hello World#

Docker#

The easiest way to run ruby is with docker.

  • create directory: 

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    mkdir app

  • Go into directory: 

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    cd app

  • Create file hello_world.rb: 

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    cat <<EOF > hello_world.rb
#!/usr/bin/env ruby

puts "Hello world"
EOF

  • Run docker: 

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    docker run \
    -ti --rm \
    -v "`pwd`:/app" \
    ruby:3.0 bash

  • Go to /app: 

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    cd /app

  • Run script: 

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    ruby ./hello_world.rb

    • Output: 
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      root@479e74cd430a:/app# ruby ./hello_world.rb
Hello world
root@479e74cd430a:/app#