From: Alexander thahartner@gmail.com
However the following command : echo "HI" > logger -t test Resulted in the message appearing twice in /var/log/messages on my CentOS 6 system.
Tested on CentOS 5.10 32bits/64bits and 6.5 64bits and I only get one appearance... Did you modify /etc/syslog.conf ? Maybe there are two entries repeating the same facility?
JD