read error occurred in operation command result data file aa...aa. error number=bbb

aa...aa: Operation command result data file name (string of up to 255 characters)

bbb: Error number (errno of the read system call)

S: Stops the reading of this file and waits for input of a file name.

O: Remove the cause of the error indicated by the error number then enter a correct file name.

To stop the test, enter the end command.