We can create a simple Google Cloud function from command line following these steps:

1. Create a project with project ID as my-first-gcp-project-id 

gcloud projects create 'heartin-gcp-project-id' --name='My First GCP Project'

You should see a response similar to as follows:

2. Set the property project. You may set it for the current workspace by running:

gcloud config set project 'heartin-gcp-project-id'

You should see a response similar to the following:

3. Enable Cloud Functions.

gcloud services enable cloudfunctions.googleapis.com

You should see a response similar to the following:

4. Clone or download the Sample Code from the Git URL:

git clone https://github.com/GoogleCloudPlatform/nodejs-docs-samples.git

5. Go to functions directory.

cd nodejs-docs-samples/functions/helloworld/

6. Deploy the function.

gcloud functions deploy helloGET --runtime nodejs6 --trigger-http

You should see a response, as follows:

7. Run the httpsTrigger URL from the previous section in a browser. You should see Hello World printed on the browser screen as follows:.