citromatik:

A couple of methods you could try:

• Scan the file and build a hash of (key,file position) pairs so you can immediately seek to the line you want. However, this requires a complete scan through the file (the first time).
• Alternatively, sort the file and use a binary search to locate the line. This way, you'd need roughly log2(line_count) seek/reads to get the data you're looking for.

In either case, you'll probably want to refer to the functions:

perldoc -f seek

perldoc -f tell

...roboticus

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