newfs(8) on FreeBSD
The text d6913b36d7d6, as FreeBSD 10.4-RELEASE shipped it.
construct a new UFS1/UFS2 file system
Flags it lists
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-E -
-J -
-L -
-N -
-O -
-S -
-T -
-U -
-a -
-b -
-c -
-d -
-e -
-f -
-g -
-h -
-i -
-j -
-k -
-l -
-m -
-n -
-o -
-p -
-r -
-s -
-t