Computer scienceSystem administration and DevOpsDockerBuilding images with Dockerfile

Dockerfile (RUN, SHELL)

Theory

Use the ARG variable in a RUN instruction

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You are working on the Dockerfile shown in the snippet below.

FROM ubuntu:22.04

LABEL author=HyperUser

ARG GREETING
RUN echo $GREETING World! > /tmp/demo.txt

ENTRYPOINT ["cat", "/tmp/demo.txt"]

What is the output when you run a container using the following command?

$ docker build --build-arg GREETING=Hello, -t ubuntu:v1 .
Enter a short text
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