[BUG] Expunge error logging from default shell or exec behaviour

Describe the bug

Expunge error logging from default shell or exec behaviour. Should be stderr for shell, probably same for exec. See attached screen capture.

To Reproduce
Steps to reproduce the behavior:

1. Go to '...'
2. Click on '....'
3. Scroll down to '....'
4. See error

Expected behavior
A clear and concise description of what you expected to happen.

Screenshots
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Desktop (please complete the following information):

• OS: [e.g. iOS]
• Browser [e.g. chrome, safari]
• Version [e.g. 22]

Smartphone (please complete the following information):

• Device: [e.g. iPhone6]
• OS: [e.g. iOS8.1]
• Browser [e.g. stock browser, safari]
• Version [e.g. 22]

Additional context
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Non è indicato alcun file sorgente né alcun test. Inizia riproducendo il comportamento predefinito di shell ed exec, poi individua dove viene registrato il loro output degli errori e confronta stdout con stderr. Il lavoro è completato quando gli errori del comportamento di shell e, probabilmente, anche del comportamento di exec vengono emessi tramite stderr senza logging predefinito indesiderato.