Never Lose Long‑Running Linux Tasks: Master the Screen Command

Install Screen

Many Linux distributions include screen by default. Verify its presence with: $ screen --version If it is not installed, add it using:

$ sudo apt install screen

Start a Screen Session

Launch a new session simply by typing: $ screen Press Enter or Space to skip the copyright screen and reach the terminal prompt. To name a session, use the -S option, e.g.: $ screen -S alvin Named sessions help differentiate multiple sessions.

List Available Commands

Inside a Screen session, press Ctrl‑a ? to view all supported shortcuts.

Detach and Reattach Sessions

When running a long task (e.g., system updates), detach the session with Ctrl‑a d. The task continues in the background even if the network drops.

Reattach the most recent session with: $ screen -r If multiple sessions exist, specify the session ID or name:

$ screen -r 4352

$ screen -r alvin

List all sessions using:

$ screen -ls

Nested Screen Sessions

Create a nested session by typing screen inside an existing one or using Ctrl‑a c. Switch between sessions with Ctrl‑a n (next) or Ctrl‑a p (previous).

Detach and Start a New Session

You can detach from a session, start a new one for a different task, and later reattach to the original session using screen -r with the appropriate ID or name.

Close a Screen Session

Terminate a session by typing Ctrl‑d or the exit command:

$ exit

Best Practices

Using screen prevents data loss from network interruptions and allows multiple tasks to run concurrently in a single window, improving productivity and reliability.