Disambiguate the options '--recurse' and '--recurse:'

Fixes: http://bugs.debian.org/537138

fdupes.1

@@ -23,7 +23,8 @@ for every directory given follow subdirectories encountered within
 .TP
 .B -R --recurse:
 for each directory given after this option follow subdirectories
-encountered within
+encountered within (note the ':' at the end of option; see the
+Examples section below for further explanation)
 .TP
 .B -s --symlinks
 follow symlinked directories
@@ -85,6 +86,15 @@ or
 .B --sameline
 is specified, spaces and backslash characters  (\fB\e\fP) appearing
 in a filename are preceded by a backslash character.
+
+.SH EXAMPLES
+.TP
+.B fdupes a --recurse: b
+will follow subdirectories under b, but not those under a.
+.TP
+.B fdupes a --recurse b
+will follow subdirectories under both a and b.
+
 .SH CAVEATS
 If fdupes returns with an error message such as
 .B fdupes: error invoking md5sum

fdupes.c

@@ -956,7 +956,8 @@ void help_text()
   printf(" -r --recurse     \tfor every directory given follow subdirectories\n");
   printf("                  \tencountered within\n");
   printf(" -R --recurse:    \tfor each directory given after this option follow\n");
-  printf("                  \tsubdirectories encountered within\n");
+  printf("                  \tsubdirectories encountered within (note the ':' at\n");
+  printf("                  \tthe end of the option, manpage for more details)\n");
   printf(" -s --symlinks    \tfollow symlinks\n");
   printf(" -H --hardlinks   \tnormally, when two or more files point to the same\n");
   printf("                  \tdisk area they are treated as non-duplicates; this\n");