I want to rotate my maillog, but I want to make sure the newly rotated log contains the last 2M lines from the previous log:    # write the last 2M lines to a new log    tail -n 2000000 /var/log/maillog > /var/log/maillog.new    # move the existing log to datestamped backup    datestamp=`date +%Y%m%d`    mv /var/log/maillog /var/log/maillog.$datestamp    # move the new log to normal log    mv /var/log/maillog.new /var/log/maillog    # tell sendmail to reload    killall -HUP sendmailThis all works, except for the fact that sendmail continues to write to the backup log file maillog.yyyymmdd instead of the proper maillog!What is the correct way to do this without having to stop sendmail first, rotate, then start again?
How to make sendmail write to new maillog
logs;sendmail;logrotate
Usually maillog written by syslogd, not by sendmail itself, so you should send SIGHUP to syslogd