C:\Documents and Settings\Owner\Desktop>perl n13.pl Name "main::OUTPUT" used only once: possible typo at n13.pl line 39 (#1) (W once) Typographical errors often show up as unique variable names. If you had a good reason for having a unique name, then just mention it again somehow to suppress the message. The our declaration is provided for this purpose. NOTE: This warning detects symbols that have been used only once so $c, @c, %c, *c, &c, sub c{}, c(), and c (the filehandle or format) are considered the same; if a program uses $c only once but also uses any of the others it will not trigger this warning. Parsing of undecoded UTF-8 will give garbage when decoding entities at n13.pl li ne 58, line 2. C:\Documents and Settings\Owner\Desktop>