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Use of uninitialized value in join or string at reg.cgi line 166 (#1)

...
Note, however, that perl optimizes your program and the operation disp
+layed in the warning may not necessarily appear literally in your pro
+gram.  

For example, "that $foo" is usually optimized into "that " . $foo, and
+ the warning will refer to the concatenation (.) operator, even thoug
+h there is no . in your  program.

    open USRNF,">>$file" or die "Couldn't find user file $file, Perl s
+ays $!\n";
...
   print PASS "\n";
   close PASS;