touch(1) on OpenBSD
The text 4de607de2c26, as OpenBSD 3.2, OpenBSD 3.1, OpenBSD 3.0, OpenBSD 2.9, OpenBSD 2.8 shipped it.
change file access and modification times
Flags it lists
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-a -
-c -
-f -
-m -
-r -
-t