how to set existing project as default in google cloud shell code example

Example 1: gcloud set project

gcloud config set project <Your-Project-Name>

Example 2: gcloud set project

gcloud auth list
* account 1
  account 2

# change the project's account if not
gcloud config set account `ACCOUNT`

#Depending on the account, the project list will be different:
gcloud projects list

- project 1
- project 2...

#Switch to intended project:
gcloud config set project `PROJECT ID`