Redshift is an open-source screen color temperature adjustment tool that automatically adjusts the screen's color temperature based on time to reduce blue light stimulation and help protect users' vision. It can smoothly transition between color temperatures, offering a natural white during the day and a warmer tone at night. Redshift can be easily installed on Ubuntu using a simple terminal command. Users can run Redshift either through command line with manual latitude and longitude settings or via a configuration file for automatic screen temperature adjustments. The tool's parameters, such as day and night temperatures, transition, and location provider, can be customized to suit individual preferences.