How to unset environment variable in Jenkins - jenkins

I have a Jenkinsfile and the JAVA_HOME environment variable is already set when the process starts up. Unfortunately, this environment variable is being passed into my container when I run a script in docker.inside and is overriding the correct value of the environment variable that is already set in the image.
How do I unset an environment variable in a Jenkins script?

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Accessing Jenkins-set environment variables from a Jenkins Plugin

If there is a Jenkins shell script build step, environment variables are set so that, for example, if you echo $WORKSPACE you see the current working directory. I am writing a custom plugin which also can execute shell commands but WORKSPACE is not set when this plugin executes.
I could see that Jenkins sets all those env variables prior to executing the shell commands the Jenkins project specifies so that they would not be already set for a custom plugin. If that is the case, it would seem like there is no way to access those env variables.
But if there is a way to obtain the values of the env variables that would be useful.

Define an Array in Bitbucket Pipelines Deployment Environment Variables

In a config.json file that's passed to Auth0's deploy cli, I have the following variable defined in a config.json file:
"CALLBACKS": ["http://localhost:3000", "https://myapplication.com" ]
That variable can be overridden by an environment variable if it's present. I'm therefore trying to put the same value in the Deployment environment variables but it's not seeing it as an array.
Anything I should do to make it understand that the value above is not a string?

How to set multiple environmental variable with Jenkins Groovy Script

I am trying to use Jenkins environmental variable with groovy scripts and assign them to environment variable so I can use those variable through out each Jenkins steps. But I cannot take out Groovy map objects. Is there anything I am doing wrong?
this is simple. In groovy script I have added two keys as "repo" and "version". Environment variables are created from that name and in a shell, I can get those simply by calling their keys.
echo $repo
echo $version

How to set environment variables used by docker container using Bamboo

I am using Bamboo for building and deploying my docker container. My code uses environment variables. I am using a shell script to set values of those variables with those values being hardcoded in .sh file. Ideally, I would like the values for those environment variables to be passed through bamboo variables. One option is to generate a shell script during bamboo build plan and call that shell script from startup file. Is there any better option to set system environment variables using bamboo variables?
When adding the Docker task in the Plan configuration, you have the option to pass environment variables.
For example, if your Dockerfile has ENV variable test_db_pass you should pass in the Docker task field "Container environment variables" the following: test_db_pass=${bamboo.test_db_pass}
It is possible to define either plan or global variables in Bamboo.
You can then use them in you build.
It's in the documentation :
https://confluence.atlassian.com/bamboo/defining-plan-variables-289276859.html

Pipeline shell step and environment variables

I want to run a shell command in a sh step, that depends on some environment variables. Now I know that there is the environment directive. If I declare all environment variables there, the command works just fine.
However, I have several pipeline scripts that all run this command with the same environment variables. So instead of declaring these variables in each script, I want to declare them only once. I tried to set environment variables for the jenkins user, in which I didn't succeed. Finally I declared them system wide (in /etc/environment) only to find, that they're still not present for the command run in the shell step.
I conclude from this that jenkins runs shell step commands in a clean environment, ignoring variables I may have declared. My question is now: how can I set environment variables for the shell step for all pipeline scripts in jenkins?

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