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When you need to combine all the coverages in a workspace, with APPEND or MAPJOIN, you can avoid typing each coverage name by using the [LISTFILE] function to create an ASCII file that lists the coverage names. You can use this ASCII file as input to the APPEND or MAPJOIN command.
This article uses an example of appending three point coverages.
Arc: &ty [listfile * -cover covlist.txt]
Arc: append outcov
Enter Coverages to be APPENDed (Type END or a blank line when done):
Enter the 1st coverage: &run covlist.txt
Enter the 4th coverage:
Done entering coverage names (Y/N)? y
Do you wish to use the above coverages (Y/N)? y
Arc: &ty [delete covlist.txt -file]