"logger -f", as described in the man page,
-f file Log to the specified file.
actually logs (the contents of) the specified file.
Regards
André
Index: src/usr.bin/logger/logger.1
===================================================================
RCS file: /cvs/src/usr.bin/logger/logger.1,v
retrieving revision 1.20
diff -u -p -r1.20 logger.1
--- src/usr.bin/logger/logger.1 28 Feb 2012 20:40:58 -0000 1.20
+++ src/usr.bin/logger/logger.1 5 Jun 2013 16:02:08 -0000
@@ -53,7 +53,7 @@ system log module.
The options are as follows:
.Bl -tag -width "-f file"
.It Fl f Ar file
-Log to the specified
+Log the specified
.Ar file .
.It Fl i
Log the process ID of the logger process
