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ASCII control characters/sequences in WSL Ubuntu #5714

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opened 2026-01-31 00:19:54 +00:00 by claunia · 2 comments
claunia commented 2026-01-31 00:19:54 +00:00
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Originally created by @fatherofinvention on GitHub (Dec 28, 2019).

Environment

Windows build number: Microsoft Windows [Version 10.0.18363.535]
Windows Terminal version (if applicable): Version: 0.7.3451.0

Any other software?
Ubuntu: 18.04.3 LTS
Python: 3.6
VIT: 2.0

Steps to reproduce

  • Install Ubuntu 18.04.3 LTS from Microsoft Store
  • Install Task Warrior
  • Install VIT 2.0 (which is using the SI control character for formatting)

Expected behavior

The SI character would render properly instead of an empty rectangle.

Actual behavior

The attached screenshot shows how the Shift In control character is rendering in WSL Ubuntu, specifically inside of Vit which is written in Python running in Windows Terminal. The font in use is Ubuntu Mono.

SI (0x0F, ^O) activates the G0 character set;
Source

I am not sure if this is a WSL issue, a Terminal issue, a code page issue, a font issue, or a Python issue. I am hoping someone more knowledgeable can comment on whether this is a fundamental limitation of WSL's support of control characters or if this can be resolved by changing a setting. I have tried numerous monospace fonts without any luck.

SI-control-characters

Thank you.

Originally created by @fatherofinvention on GitHub (Dec 28, 2019). # Environment ```none Windows build number: Microsoft Windows [Version 10.0.18363.535] Windows Terminal version (if applicable): Version: 0.7.3451.0 Any other software? Ubuntu: 18.04.3 LTS Python: 3.6 VIT: 2.0 ``` # Steps to reproduce - Install Ubuntu 18.04.3 LTS from Microsoft Store - Install Task Warrior - Install VIT 2.0 (which is using the SI control character for formatting) # Expected behavior The SI character would render properly instead of an empty rectangle. # Actual behavior The attached screenshot shows how the [Shift In control character](https://en.wikipedia.org/wiki/Shift_Out_and_Shift_In_characters) is rendering in WSL Ubuntu, specifically inside of [Vit ](https://github.com/scottkosty/vit) which is written in Python running in Windows Terminal. The font in use is [Ubuntu Mono](https://fonts.google.com/specimen/Ubuntu+Mono). `SI (0x0F, ^O) activates the G0 character set;` [Source](http://man7.org/linux/man-pages/man4/console_codes.4.html) I am not sure if this is a WSL issue, a Terminal issue, a code page issue, a font issue, or a Python issue. I am hoping someone more knowledgeable can comment on whether this is a fundamental limitation of WSL's support of control characters or if this can be resolved by changing a setting. I have tried numerous monospace fonts without any luck. ![SI-control-characters](https://user-images.githubusercontent.com/24985048/71548000-7bdc8100-295c-11ea-8ab8-cbd48f394436.jpg) Thank you.
claunia added the Resolution-Duplicate label 2026-01-31 00:19:54 +00:00
claunia commented 2026-01-31 00:19:55 +00:00
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@DHowett-MSFT commented on GitHub (Dec 28, 2019):

This sounds like a /dupe of #3487

@DHowett-MSFT commented on GitHub (Dec 28, 2019): This sounds like a /dupe of #3487
claunia commented 2026-01-31 00:19:55 +00:00
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@ghost commented on GitHub (Dec 28, 2019):

Hi! We've identified this issue as a duplicate of another one that already exists on this Issue Tracker. This specific instance is being closed in favor of tracking the concern over on the referenced thread. Thanks for your report!

@ghost commented on GitHub (Dec 28, 2019): Hi! We've identified this issue as a duplicate of another one that already exists on this Issue Tracker. This specific instance is being closed in favor of tracking the concern over on the referenced thread. Thanks for your report!
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Reference: starred/terminal#5714
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