You already got suggestions on how to fix these errors:

Variable "$CONFIG" is not imported at ./Chapter9_Exer3 line 15.
Variable "$OUTPUT" is not imported at ./Chapter9_Exer3 line 20.
Global symbol "$CONFIG" requires explicit package name at ./Chapter9_E
+xer3 line 15.
Global symbol "$OUTPUT" requires explicit package name at ./Chapter9_E
+xer3 line 20.

[download]

You open the filehandles CONFIG and OUTPUT, and then try to use the variables $CONFIG and $OUTPUT, these are two different things. You need to either change your open calls to use lexical variables, like I showed here, or remove the $ sigil, as pointed out by Your Mother and kcott.

syntax error at ./Chapter9_Exer3 line 8, near "'three_Freds.out':"
Can't use global $0 in "my" at ./Chapter9_Exer3 line 12, near "Usage: 
+$0"

[download]

The first error was pointed out by poj: You have a typo in that line. The second error is just being caused by the parser getting confused after seeing the first error.

In reply to Re^2: Usage of File Handles by haukex
in thread Usage of File Handles by catfish1116

Title:
Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
to format your post, it's "PerlMonks-approved HTML":


  • Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!
  • Titles consisting of a single word are discouraged, and in most cases are disallowed outright.
  • Read Where should I post X? if you're not absolutely sure you're posting in the right place.
  • Please read these before you post! —
  • Posts may use any of the Perl Monks Approved HTML tags:
    a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, details, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, summary, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr
  • You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)
            For:     Use:
    & &amp;
    < &lt;
    > &gt;
    [ &#91;
    ] &#93;
  • Link using PerlMonks shortcuts! What shortcuts can I use for linking?
  • See Writeup Formatting Tips and other pages linked from there for more info.