Codex CLI executes commands successfully but stdout/stderr is always empty (exit code 0)

What version of Codex is running?

v0.80.0

What subscription do you have?

gpt pro

Which model were you using?

gpt-5.2-codex high

What platform is your computer?

macos

What issue are you seeing?

Description

When using Codex CLI, all commands execute successfully (exit code = 0), but stdout and stderr are always empty, including basic commands like echo, pwd, ls, /bin/echo, etc.
This makes the CLI effectively unusable for any task requiring command output.

This issue persists across restarts and appears to be a systemic problem in the runner/output capture layer rather than a user environment issue.

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Environment

• Codex CLI version: v0.80.0
• OS: macOS (Intel Mac, macOS 10.15.7)
• Shell: zsh / bash (tested both)
• Project directory: ~/Documents/project/android-assistant
• Terminal: Web UI + Codex CLI

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Expected behavior

Commands such as:

echo test
pwd
ls -la
whoami
date

### What steps can reproduce the bug?

### Bug description
Codex CLI executes commands successfully (exit code = 0), but stdout/stderr is always empty.  
This happens for all commands, including basic ones like `echo`, `pwd`, `ls`, `/bin/echo`, etc.  
The issue persists across restarts and appears unrelated to shell config or user environment.

### Steps to reproduce
1. Open Codex CLI (version v0.80.0)
2. Run any of the following commands:
   ```bash
   echo test
   pwd
   ls -la
   whoami
   /bin/echo test
   /bin/ls -la .


### What is the expected behavior?

_No response_

### Additional information

_No response_