Re: Uninitialized value in string eq error but I initialized

I would bet it's because one of your input lines doesn't have enough columns, and, in particular, doesn't have the $colN-th column.

When $columns[$colN] is undefined, then trim returns undef which makes $NSC undefined causing the Uninitialized value in string eq error message.

To check this, right after spliting the columns just put in a check like:

...
while ($line = <ALL>) {
    my @columns = split /,/, $line;
    warn "column $colN not found" unless defined($columns[$colN]);
    ...
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Re^2: Uninitialized value in string eq error but I initialized by Anonymous Monk on Jan 05, 2008 at 22:54 UTC
Thanks for the answer(s). definitely the colum is there. It is a middle column and I am getting the error literally thousandtimes (every line I guess). The part causing troubles is: `foreach my $id (@ids) { if ($id eq $NSC) { print MY $line; } }` [download] and the uninitialized value is * $id. *. And it causes the error, I get the result but probably because thousands of error messages it takes longer time. Could the error be caused by the fact that i declared my @ids=()? I will check those libraries definitely, but it would take a begginer some time, so I am still seeking my error. Tx. to all karpatov	[reply] [d/l]
Re^3: Uninitialized value in string eq error but I initialized by Anonymous Monk on Jan 05, 2008 at 23:11 UTC
Well I incorported the recommended warn code (and will use the trick latter as well), but it is not executed, and the error is really on every single line :-(.	[reply]