This specifies the name of the log file. The file name can include special characters. For more information, see Section 3.3. Special formatters. The default value is %L/logfile, a file named logfile in LogDir. For more information, see Section 3.7.12. LogDir. Special character %0 is replaced by the priority integer and %1 by the log message.

Here is an example of using Filename:

# Log file goes in /var/log, with year number
Filename /var/log/%Y-radius.log

If Filename starts with a vertical bar character |, the rest of the filename is assumed to be a program to which the output is to be piped. Otherwise the output is appended to the named file.

# Pipe to my-log-prog
Filename |/usr/local/bin/my-log-prog