screen:tldr:721e5

The command "Ctrl + A, D" is used in certain software or systems to detach or disconnect, but keep a process running in the background. Here is an explanation of each part of the command:

1. Ctrl: The "Ctrl" key, also known as the control key, is a modifier key on a keyboard. It is usually located on the bottom left or bottom right side of the keyboard. Holding down the Ctrl key while pressing another key allows you to perform specific actions or shortcuts.

2. +: The plus symbol "+" in this context indicates that you need to press multiple keys simultaneously.

3. A: The letter "A" represents the specific key on the keyboard that needs to be pressed while holding down the Ctrl key.

4. , (comma): The comma serves as a separator to indicate that the next key needs to be pressed.

5. D: The letter "D" represents another key that needs to be pressed while holding down the Ctrl key.

When you press and hold the Ctrl key, then press the letter A, and without releasing either key, press the letter D, you are executing the command "Ctrl + A, D." This command is commonly used in programs that run in a terminal or command-line interface, such as screen or tmux.

In such programs, pressing "Ctrl + A, D" allows you to detach or disconnect from the current session while keeping the session running in the background. In other words, the program will continue to run even after you disconnect or close the terminal window. This is useful when you want to temporarily leave a running process and come back to it later without interrupting its execution.