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I am looking to create a cron job that opens a directory loops through all the logs i have created and deletes all lines but keep the last 500 for example.
I was thinking of something along the lines of
tail -n 500 filename > filename
Would this work?
I also not sure how to loop through a directory in bash.
Think about using logrotate.
It will not do what you want (delete all lines but the last 500), but it can take care of logfiles which are bigger than a certain size (normally by comressing the old ones and deleting them at some point). Should be widely available.