Linux下如何临时暂停/挂起Screen终端进程并后续恢复？

Great question—this is exactly the kind of scenario where Unix/Linux's process control tools shine alongside Screen. Let's break down two practical approaches depending on whether you want to pause just your R process or all tasks in the target Screen session:

方法1：暂停单个进程（比如你的R运行任务） #

If you only need to pause the specific R process (and leave other tasks in the same Screen session running), here's how to handle it:

• 当你在Screen会话内时：

  1. Switch to the window running your R process (use Ctrl+A + <number> to toggle between Screen windows if you have multiple)
  2. Press Ctrl+Z — this will immediately pause the R process, and you'll see a prompt like [1]+ Stopped R
  3. If you want to free up the Screen window for other work while keeping R paused, type bg to move the process to the background paused state
  4. To resume, type fg (if you have multiple paused tasks, use jobs to check task numbers, then fg %<number> like fg %1 to target a specific one)

• 当你不在Screen会话内时：
  You can send pause/resume commands directly to the target session without attaching to it first:

  1. List your Screen sessions to get the session name/ID: screen -list (you'll see something like 12345.my-r-session (Detached))
  2. Send the pause signal to the session: screen -S my-r-session -X stuff "^Z" (the ^Z represents Ctrl+Z, and stuff sends keystrokes to the Screen session)
  3. To resume later: screen -S my-r-session -X stuff "fg\n" (the \n simulates pressing Enter to run the fg command)

方法2：暂停整个Screen会话的所有进程 #

If you want to pause all processes in a Screen session to free up CPU entirely, use Unix's process stop signals:

1. Get the PID of your Screen session: from screen -list, the first part of the session ID is the PID (e.g., 12345 from 12345.my-r-session)
2. Send the STOP signal to pause the entire session: kill -STOP 12345
   • All processes in the session will stop using CPU immediately, but their state will stay in memory
3. To resume all processes in the session: kill -CONT 12345
   • After this, you can reattach with screen -r my-r-session and everything will pick up right where it left off

关键注意事项 #

• Neither approach will terminate your processes—they're just temporarily halted. All your R process's state and progress will be preserved, so you can resume exactly where you paused, which perfectly matches your requirement of keeping long-running tasks alive while freeing up算力.
• Paused processes don't use CPU, but they do still occupy system memory. If your goal was to free up memory, this method isn't the right fit, but it's ideal for your core need of releasing computing power temporarily.
• For R specifically, using Ctrl+Z is safe—R will properly save your current calculation state, so resuming will continue your work without issues.

内容的提问来源于stack exchange，提问作者user3091668