ENV

ENV instruction is used to set the environment variable to the value. This is in key-value format. Environment variables set using the ENV instructions can be used in other instructions later.

Syntax

ENV <variable(key)>=<value>

Also, you can use multiple <key>=<value> … variables to be set at once.

ENV <key1>=<value1> <key2>=<value2> ...

Example

ENV MY_NAME="Sagar Budhathoki"
ENV FRIEND1=Saroj\\ Shrestha
ENV FRIEND2=Jiwan

ENV MY_NAME="Sagar Budhathoki" FRIEND1=Saroj\\ Shrestha \\
		FRIEND2=Jiwan

Both will result the same.

Alternatively,

ENV instruction can be used by omitting the =, But it doesn’t allow to take multiple variables to be set in a single ENV.

Syntax

ENV VAR1 VALUE1

But, the following will result variable VAR1 with value “VALUE1= VAR2=VALUE2”:

ENV VAR1 VALUE1= VAR2=VALUE2