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A Git commit ID is a 40 digits long SHA-1 hash, that can be abbreviated up to the shortest 4 digits version (7 by default). In this note i am showing how to abbreviate the long hash to a short hash in Git and how to display the abbreviated hashes in the outputs of the In Git we can gracefully revert all changes to the specific commit without using the potentially dangerous git reset command. In this note i am showing how to undo local changes by making a rollback to the specific commit and how to revert a commit that has already been It may be useful to run an Ansible playbook on a local system. For example for putting a playbook in a crontab or for a new host provisioning. In this note i am showing the several ways to run Ansible playbook locally. During troubleshooting of Ansible issues it is useful to know how to enable debug mode and increase the level of verbosity. To enable debug and increase verbosity in Ansible you can pas* the corresponding environment variables on the command line or define these settings in In this article i am showing how to clear Git history by removing all commits. You may need this if you want to delete sensitive data from the history of Git commits. After such cleanup you will have the latest version of your Git repository, but with the one commit only. In Ansible playbooks, it is often a good practice to test if a variable exists and what is its value. Particularity this helps to avoid different “VARIABLE IS NOT DEFINED” errors in Ansible playbooks. In this context there are several useful tests that you can Every command or application returns an exit status, also known as a return status or exit code. A successful command or application returns a 0, while an unsuccessful one returns a non-zero value that usually can be interpreted as an error code. In Linux you can get the To connect to a Git repository with authentication over HTTP(S), every time it needs to set a username and pas*word. You can configure Git to