问题
Lets say I have a currently running screen session I am interacting with through putty. I've realized that the scrollback buffer is too small and would like to increase it without starting a new screen session.
Is there a way to do this?
回答1:
The man page explains that you can enter command line mode in a running session by typing Ctrl+A, :, then issuing the scrollback <num> command.
回答2:
Press Ctrl-a then : and then type
scrollback 10000
to get a 10000 line buffer, for example.
You can also set the default number of scrollback lines by adding
defscrollback 10000
to your ~/.screenrc file.
To scroll (if your terminal doesn't allow you to by default), press Ctrl-a ESC and then scroll (with the usual Ctrl-f for next page or Ctrl-a for previous page, or just with your mouse wheel / two-fingers). To exit the scrolling mode, just press ESC.
Another tip: Ctrl-a i shows your current buffer setting.
回答3:
There is a minimal amount of "default" buffer when you startup a 'screen' session within your 'putty session'. I use screens a lot in my work, so I can tell you that you will not have a combination of 'screen' buffer & 'putty' buffer within your 'screen' session.
Setting the default number of scrollback lines by adding defscrollback 10000
to your ~/.screenrc file is the correct solution.
By the way, I use "defscrollback 200000" in my ./screenrc file.
回答4:
For posterity, this answer is incorrect as noted by Steven Lu. Leaving original text however.
Original answer:
To those arriving via web search (several years later)...
When using screen, your scrollback buffer is a combination of both the screen scrollback buffer as the two previous answers have noted, as well as your putty scrollback buffer.
Be sure that you are increasing BOTH the putty scrollback buffer as well as the screen scrollback buffer, else your putty window itself won't let you scroll back to see your screen's scrollback history (overcome by scrolling within screen with ctrl+a->ctrl+u)
You can change your putty scrollback limit under the "Window" category in the settings. Exiting and reopening a putty session to your screen won't close your screen (assuming you just close the putty window and don't type exit), as the OP asked for.
Hope that helps identify why increasing the screen's scrollback buffer doesn't solve someone's problem.
来源：https://stackoverflow.com/questions/8760346/how-do-i-increase-the-scrollback-buffer-in-a-running-screen-session