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Access Rights and File Mode

  • 3 types of users (owner, user group, other) 3 types of access (read, write, execute) give 9 binary flags 
  • 3 additional flags: suid, sgid, sticky define file mode
    • suid (set user id): If executable has suid set to 1 then process gets UID of file owner.  Otherwise the current person editing.
    • sgid (set group id): If executable has sgid set to 1 then process gets GID of file owner.  Otherwise the current group editing.
    • sticky: If set to one, kernel will keep program in memory even after execution terminates

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