reopen -- Change the type or changelist number of an opened file
p4 reopen [ -c changelist# ] [ -t filetype ] file ...
Reopen takes an already opened file and reopens it for the current
user, optionally changing its changelist or filetype.
The changelist must have previously been created with p4 change
or may be the 'default' changelist.
See 'p4 help filetypes' for a list of types.