l50 / goutils / 7237386378

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Enhanced RunCmd Functionality and Testing in sysutils (#529)

**Changed:**
- Revised `RunCmd` in `sysutils.go` to return combined output and error.
- Updated `handleOutput` to write to output buffer alongside the OutputHandler.
- Simplified output handling logic by removing redundant channels.

**Updated Testing:**
- Modified `TestRunCmd` in `sysutils_test.go` to test both default and custom output handlers.
- Ensured tests validate command output accuracy and error handling.
- Included example usage of `RunCmd` with a custom log output handler.

**Note:**
- These changes enhance the `RunCmd` function, providing more flexibility in capturing and handling command output, and robust testing ensures reliability across different scenarios.

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