How to Ignore certain files from Git commit (modified but never need to commit)

Sometimes we may need to ignore certain modified files from Git commit (Eg: config/database.yml).
This can be done by issuing  the following command from your project path

• git update-index --assume-unchanged config/database.yml

Or in case of folder

• git update-index --assume-unchanged folder-name/

In the case of a new folder or file (Not added to GIT before) we can ignore by adding it to .gitignore file

• Create a .gitignore file if doesn't exist in your project path
• Add the required folder or file path in it.

          # Ignore bundler config

             .bundle

         # Ignore the default SQLite database.

            db/*.sqlite3

         # Ignore all logfiles and tempfiles.

           log/*.log

           tmp