dockerfile.run

irb2.1

Interpreter of object-oriented scripting language Ruby

Debian

RUN apt-get update && \
    apt-get install -y ruby2.1

Alpine

RUN apk add ruby2.1

Raspbian

RUN apt-get update && \
    apt-get install -y ruby2.1

click the source code to copy install irb2.1 on any operating system with command-not-found.com