This tip is provided courtesy of https://www.informit.com.
Whenever ontape asks for a tape to be mounted, you must press the Enter key in order to continue. Most system administrators implement a simple routine to accomplish this task, which is useful when you use the cron utility of UNIX to run a script at a specified time. The following example should resolve the please-mount-the-tape problem. (Thanks to our friends at c.d.i., comp.databases.informix.)
% ontape -s -L 0<
Or if you're editing your script using vi, for example, you just need to press the Enter key in the here-document between the two hit words, as follows:
ontape -s -L 0 <
For more information on Informix Unleashed, go to https://www.informit.com/product/0672306506/ or http://www.mcp.com/sams.