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There is no doubt a far quicker way of doing this (we're going through the file twice, so it'll take a while), but something like

#!/bin/ksh

matches=`grep -n "TIMESTAMP_HERE" logfile | cut -f1...

This is still going to be slow, but nethertheless, if you're using GNU grep (please state if you're not, try "grep --version", if this displays an error, you're not using GNU grep), do something like...