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Code Quote by Ken Thompson

“You can't trust code that you did not totally create yourself.” quote by Ken Thompson
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“You can't trust code that you did not totally create yourself.”

Ken Thompson

About This Quote

Source Interview: Unix History, 1979

Only code you fully understand and control can be trusted; reliance on others' code invites risk.

In simple terms: Trust only code you fully understand.

Key Takeaway

Write and review your own code.

Themes

trust software control security

Mood

pragmatic cautious

Type

technical professional

When to use this quote

  • open‑source contributions
  • team projects
  • critical systems

Key Concepts

software engineering risk management ownership

Questions to Reflect On

  • How do you verify third‑party code?
  • When is it okay to rely on others' code?
A Different Perspective

Collaboration can improve code quality despite trust concerns.

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