Something strange happened here.
I tried to partition a pendrive with fdisk using expert mode to change the geometry
After deleting all partitions then typed;
Command (m for help): x [Enter]
x: unknown command
a toggle a bootable flag
b edit bsd disklabel
c .... etc.
However this command worked for me about one week ago. The only difference was then running on FC3 and now running on DSL.
Please advise. TIA