git config --bool --get gerrit.createChangeId is a command used in the Git version control system to retrieve the value of the configuration option gerrit.createChangeId. This option determines whether a change-id should be created for each commit message when pushing to a Gerrit server.

The --bool flag specifies that the value being retrieved is a boolean, which means it can be either true or false. The --get flag specifies that the command should retrieve the value of the specified configuration option.

The gerrit.createChangeId option is used in conjunction with Gerrit, which is a web-based code review tool that integrates with Git. When this option is set to true, a change-id will be automatically added to the commit message when pushing to a Gerrit server. This change-id is used by Gerrit to identify a particular change and to track its progress through the code review process.

To set the value of the gerrit.createChangeId option, you can use the command git config --bool --add gerrit.createChangeId true or git config --bool --add gerrit.createChangeId false, depending on the desired value.