+dit(bf(transfer logging)) The "transfer logging" option enables per-file
+logging of downloads and uploads in a format somewhat similar to that
+used by ftp daemons. If you want to customise the log formats look at
+log_send, log_recv and log_transfer in log.c
+
+dit(bf(log format)) The "log format" option allows you to specify the
+format used for logging file transfers when transfer logging is
+enabled. The format is a text string containing embedded single
+character escape sequences prefixed with a percent (%) character.
+
+The prefixes that are understood are:
+
+itemize(
+ it() %h for the remote host name
+ it() %a for the remote IP address
+ it() %l for the length of the file in bytes
+ it() %p for the process id of this rsync session
+ it() %o for the operation, which is either "send" or "recv"
+ it() %f for the filename
+ it() %P for the module path
+ it() %m for the module name
+ it() %u for the authenticated username (or the null string)
+)
+
+The default log format is "%o %h [%a] %f %l"
+
+dit(bf(socket options)) This option can provide endless fun for people
+who like to tune their systems to the utmost degree. You can set all
+sorts of socket options which may make transfers faster (or
+slower!). Read the man page for the setsockopt() system call for
+details on some of the options you may be able to set. By default no
+special socket options are set.
+