There is a command group 'az_pipelines_variable'. This group of commands could 'manage pipeline variables'. The group of commands has global parameter '--debug' which means 'Increase logging verbosity to show all debug logs.'. The group of commands has global parameter '--help -h' which means 'Show this help message and exit.'. The group of commands has global parameter '--only-show-errors' which means 'Only show errors, suppressing warnings.'. The group of commands has global parameter '--output -o' which means 'Output format.'. The group of commands has global parameter '--query' which means 'JMESPath query string. See <a href="http://jmespath.org/">http://jmespath.org/</a> for more information and examples.'. The group of commands has global parameter '--subscription' which means 'Name or ID of subscription. You can configure the default subscription using `az account set -s NAME_OR_ID`.'. The group of commands has global parameter '--verbose' which means 'Increase logging verbosity. Use --debug for full debug logs.'. This group contains a child command 'az_pipelines_variable_update'.The syntax is: az pipelines variable update --name
                             [--allow-override {false, true}]
                             [--detect {false, true}]
                             [--new-name]
                             [--org]
                             [--pipeline-id]
                             [--pipeline-name]
                             [--project]
                             [--prompt-value {false, true}]
                             [--secret {false, true}]
                             [--value]. The parameter '--name' is required. It is used to name of the variable.. The parameter '--allow-override' is optional. indicates whether the value can be set at queue time.. The parameter '--detect' is optional. automatically detect organization.. The parameter '--new-name' is optional. new name of the variable.. The parameter '--org --organization' is optional. azure devops organization url. you can configure the default organization using az devops configure -d organization=org_url. required if not configured as default or picked up via git config. example: https://dev.azure.com/myorganizationname/.. The parameter '--pipeline-id' is optional. id of the pipeline.. The parameter '--pipeline-name' is optional. name of the pipeline. ignored if --pipeline-id parameter is supplied.. The parameter '--project -p' is optional. name or id of the project. you can configure the default project using az devops configure -d project=name_or_id. required if not configured as default or picked up via git config.. The parameter '--prompt-value' is optional. set it to true to update the value of a secret variable using environment variable or prompt via standard input.. The parameter '--secret' is optional. if the value of the variable is a secret.. The parameter '--value' is optional. new value of the variable. for secret variables, use --prompt-value parameter, to be prompted to enter it via standard input. for non-interactive consoles it can be picked from environment variable prefixed with azure_devops_ext_pipeline_var_ e.g. a variable nameed `mysecret` can be input using environment variable azure_devops_ext_pipeline_var_mysecret.. 