mkfs.gfs(8) on Linux
The text a59f0e792c04, as Debian 7 (Wheezy), Debian 6.0 (Squeeze) shipped it. The page shows this text now.
Make a GFS filesystem
Flags it lists
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-D -
-J -
-O -
-V -
-b -
-h -
-j -
-p -
-q -
-r -
-s -
-t