S Sequential input mode is used for pipes and other sequential devices such as hardware ports. W Sequential update mode is used for pipes and other sequential devices such as ports. I record-length specifies a new logical record length for the file. To use the existing record length for the file, specify a length of 0 or do not provide a value here. To use the existing record format, do not specify a value here.
D specifies the default record format.
E specifies the editable record format. F specifies that the file contains fixed-length records. P specifies that the file contains printer carriage control in host-dependent record format. V specifies that the file contains variable-length records. Opening an existing file for output may overwrite the current contents of the file without warning.