splain/diagnostics
Use of uninitialized value in substitution (s///) at
        /home/rui/public_html/cgi-bin/e/e_update.pl line 49 (#1)
    (W uninitialized) An undefined value was used as if it were alread
+y
    defined.  It was interpreted as a "" or a 0, but maybe it was a mi
+stake.
    To suppress this warning assign a defined value to your variables.

    To help you figure out what was undefined, perl will try to tell y
+ou the
    name of the variable (if any) that was undefined. In some cases it
+ cannot
    do this, so it also tells you what operation you used the undefine
+d value
    in.  Note, however, that perl optimizes your program and the opera
+tion
    displayed in the warning may not necessarily appear literally in y
+our
    program.  For example, "that $foo" is usually optimized into "that
+ "
    . $foo, and the warning will refer to the concatenation (.) operat
+or,
    even though there is no . in your program.

Use of uninitialized value in length at
        /home/rui/public_html/cgi-bin/e/e_update.pl line 53 (#1)

[download]
If you use warnings; or -w, you get warnings. If you're confident your program is working as it should, you could add no warnings 'uninitialized'; to silence only these warnings, or you could simply not turn on warnings.

Or you could turn any undefined values from split into empty string 

... $j) = map { defined ? $_ : '' } split ...

[download]
Its much less work to let Text::CSV handle CSV

In reply to Re: "Use of uninitialized value" annoying message by Anonymous Monk
in thread "Use of uninitialized value" annoying message by kepler

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