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You didn't say anything about needing sorted output before (and you showed us one example where the output you said you wanted was not sorted). But, making several more very wild assumptions based...

If I correctly understand what you're trying to do (and I'm not convinced that I do), you can combine your script that produces your data file:
grep -rn "died" /tmp/grepd.0*|cut -d':' -f1|cut -d'.'...

Did you try the proposal in post#7?

How about (assuming you are using bash which you failed to mention)ARR=($(awk '/died/ {T[$2]} END {for (i in T) print i+0}' FS="." file))