usage: rpcdump [-r|-m] [-c|-f] [-d message length]
[-t [start][,end]]
[-s service group name[,service name]...]
[-b node identifier[,node identifier]...]
[-v server name[,server name]...]
[-p pid[,pid]...][-x xid[,xid]...]
[-n [start number][,end number]][file name]

The usage of the rpcdump command is displayed. This message is output when the command format is incorrect.

S: Does not process the command.

O: Reenter the command in the correct format.