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Truncating log from first line

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linux-howto

http://unix.stackexchange.com – I am making a simple IRC bot in bash and I want prevent its log from growing to infinity. For example it could be shortened always when reaching set number of lines. How can I do that easily? For example by cutting the file with removing first line(s)? If possible, I would like to avoid sed/awk this time :) (HowTos)