graff,
Presumably, the files need to be appended in the order encountered. Part of the long story unmentioned is a lot of guarded responses to my inquiries for additional information. A cut | sort | uniq might not be a bad idea to pre-process the file to get a list of unique file names though.

Cheers - L~R

In reply to Re^2: Performance Trap - Opening/Closing Files Inside a Loop by Limbic~Region
in thread Performance Trap - Opening/Closing Files Inside a Loop by Limbic~Region

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