Here is the question: How to truncate a file from the begining to a certain point in the file?
The question is whether this file is ASCII text so line-based tools (such as tail) work, or whether you are truncating a binary file, in which case "split -b" is probably a better bet.
If you've got a logfile named /var/log/messages, and you want to truncate that to the last 100 lines:
mv /var/log/messages /var/log/messages.$$ tail -100 < /var/log/messages.$$ > /var/log/messages rm -f /var/log/messages.$$
Use "wc -l" and "grep -n" to identify where to truncate the file if it's not a fixed size that you want...
-- -Chuck
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