What is the purpose of the update-ref command in Git and what low-level operations does it enable?

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What is the purpose of the update-ref command in Git and what low-level operations does it enable?

Key points

  • Enables safe updating of references in Git
  • Supports atomic CAS operations for data integrity
  • Used by higher-level commands and scripts
  • Facilitates custom ref management
  • Not used to update remote tracking references after a git fetch operation

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