chflag

OS X flags for further controlling what can be done with folders and files.

http://www.macosxhints.com/article.php?story=20031017061722471

  • arch - "archived flag"
  • opaque - "opaque flag"
  • nodump - "nodump flag"
  • sappnd - "system append-only flag"
  • schg - "system immutable flag"
  • uappnd - "user append-only flag"
  • uchg - "user immutable flag"

Lock a file from being moved, renamed or deleted:

chflags uchg filename

Undo it with:

chflags nouchg filename

Technology:

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