touch(1) on macOS
The text 81d160a2b827, as Mac OS X 10.3.9, Mac OS X 10.3.8, Mac OS X 10.3.7, Mac OS X 10.3.6, Mac OS X 10.3.5, Mac OS X 10.3.4, Mac OS X 10.3.3, Mac OS X 10.3.2, Mac OS X 10.3.1, Mac OS X 10.3 shipped it.
change file access and modification times
Flags it lists
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-a -
-c -
-f -
-h -
-m -
-r -
-t