gfxattr(1) on Linux
The text 87291720c95e, as Debian 7 (Wheezy), Debian 6.0 (Squeeze) shipped it.
Manipulate extended attributes in Gfarm file system
Flags it lists
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-? -
-c -
-f -
-g -
-l -
-m -
-r -
-s -
-x