touch(1) on FreeBSD
The text 81d160a2b827, as FreeBSD 5.5-RELEASE, FreeBSD 5.4-RELEASE, FreeBSD 5.3-RELEASE, FreeBSD 5.2.1-RELEASE, FreeBSD 5.2-RELEASE, FreeBSD 5.1-RELEASE, FreeBSD 5.0-RELEASE shipped it.
change file access and modification times
Flags it lists
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-a -
-c -
-f -
-h -
-m -
-r -
-t