ON-Bar and ontape configuration parameters and environment variable

Many properties of the ON-Bar and ontape utilities are controlled by configuration parameters in the onconfig file. ON-Bar also has an environment variable.

Important: ON-Bar does not use the TAPEDEV, TAPEBLK, TAPESIZE, LTAPEBLK, and LTAPESIZE configuration parameters. ON-Bar checks if LTAPEDEV is set to /dev/null on UNIX or NUL on Windows.