Specifies the record format.
The allowed values have the following meaning:
F - Fixed-length records
V - Variable-length records
U - Undefined-length records
B - Records are blocked
A - Records contain ASCII printer control characters
M - Records contain machine code control characters
S - For variable-length records, records may span blocks
T - Records may be written into overflow tracks
Default value: FB
Example: --recfm FB
Allowed values: F, FA, FM, FB, FBA, FBM, FS, FSA, FSM, FT, FTA, FTM, FBS, FBT, U, UA, UM, UT, UTA, UTM, V, VA, VM, VB, VBA, VBM, VS, VSA, VSM, VT, VTA, VTM, VBS, VBT