Display problem when using "less" command

[TypicalSEE]

Windows: Microsoft Windows [版本 10.0.19041.804]
Terminal: 1.6.10571.0

Hi, I'm using OpenSSH to connect to a remote Linux server under Windows Terminal. But the output of "less -SN" seems not normal. The first screenshot shows it: the 19th line appears besides the 1st line. The second screenshot is the normal output (after I quit and type that command again). Unexpected output were not about a fixed line. Sometimes it's the 1st line overlapping with another line but other times it was some other lines repeating themselves. I had been using Putty to connect to a remote servers before but nerver met this problem so I think it might be a bug of Windows Terminal. Thanks.

[zadjii-msft]

@TypicalSEE Which version of ssh are you using?

[DHowett]

This sounds like #9176.

[TypicalSEE]

@TypicalSEE Which version of ssh are you using?

"OpenSSH_for_Windows_7.7p1, LibreSSL 2.6.5", installed from Windows 10 “Optional Feature”.

[DHowett]

In that case, I suspect that you're hitting the screen size change buffering issue in PowerShell/openssh-portable#426. Even though it doesn't look like the screen size is changing, less is turning on the "alternate buffer" which reports a window resize. OpenSSH, until pull 426, had trouble handling the resize event.

If you run OpenSSH 8.1 from the win32-openssh releases page, does it go away?

[TypicalSEE]

Downloaded OpenSSH 8.1 from that page and tried it, the problem still exists. By the way, ssh version of my remote server is "OpenSSH_7.4p1, OpenSSL 1.0.2k-fips 26 Jan 2017". Should I also upgrade that one?

[jdebp]

Three answers will help the Microsoft (and other) people:

• Does this happen as you scroll up and down? Or initially when less first displays the file?
• What happens when you tell less to redraw the screen?
• What is the value of the TERM environment variable on the system that is actually running the less program?