In terms of file permissions, what does the "s" stand for when seen in a permission string like "drwxr-sr-x"?

  • Set user or group ID
  • Special permissions
  • Sticky bit
  • Synchronized access
The "s" in a permission string like "drwxr-sr-x" signifies the "Set user or group ID" permission. When set on an executable file, it allows the user who runs the file to temporarily inherit the permissions of the file's owner or group, depending on where it's set (user or group ID).
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