docker expose environment variable code example

Example 1: docker how to echo env variable in bash

docker exec <container-name> env

Example 2: docker ARG

$ docker build --build-arg some_variable_name=a_value

Example 3: dockerfile env variabes

FROM busybox
ENV foo /bar
WORKDIR ${foo}   # WORKDIR /bar
ADD . $foo       # ADD . /bar
COPY \$foo /quux # COPY $foo /quux

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