In a UNIX environment, you can use pipe-device arrays to connect custom programs to the input or output of the onpload utility. Although pipe-device arrays provide the simplest way to customize the input or output of onpload, connecting the standard I/O of programs is less efficient than directly incorporating the functionality into onpload.
The ipload utility identifies custom software by the driver name that you assign to the record-format definitions.
To incorporate custom file-handling software directly into the onpload program: