example to access variables accross stages using stageDependencies with bash in azure devops

.azure-pipelines.yml

trigger:
- main

pool:
  vmImage: ubuntu-latest
  

stages:
  - stage: create_var_stage
    jobs:    
    - job: create_var_job
      steps:        
        - script: |
            TEST_TAG="my_test_tag_0.1.0"
            echo "##vso[task.setvariable variable=TEST_TAG;isOutput=true]$TEST_TAG"
          name: create_var_task
          

  - stage: test_var_stage
    # this is mandatory if the stage you want to get var from is not directly executed before this stage
    dependsOn: create_var_stage
    jobs:    
    - job: test_var_job
      # define vars which are available in the complete job
      variables:
        TEST_TAG: $[ stageDependencies.create_var_stage.create_var_job.outputs['create_var_task.TEST_TAG']]
      steps:        
        - script: |
            echo "------"
            echo $(TEST_TAG)
            echo "----"