Re^4: Filtering Output from two files

It is me who posted anonymously since we aren't allowed to log in at the university.
I didn't get where I missed "sigil $ in line once".
Furthermore, i am getting errors such as Use of uninitialized value in line 34 at variables $row and $fields at the penultimate line.
So when i place the print $row if exists $hash{$fields[0]}; after the loop it gives an error "Perl requires explicit package name"
i am really a novice at this if you could guide me in this I would learn more.

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Re^5: Filtering Output from two files by LanX (Saint) on Feb 05, 2018 at 15:10 UTC
> It is me who posted anonymously I'm glad you are making progress. :) > I didn't get where I missed "sigil $ in line once". `$hash{line}=1; # should be $hash{$line}=1;` [download] > Use of uninitialized value in line 34 You probably parse empty lines resulting in undefined variables. Skip them with `next` , compare Re: Filtering Output from two files > after the loop The print belongs inside the loop. please use code tags and indentation in your next post. Cheers Rolf _{(addicted to the Perl Programming Language and ☆☆☆☆ :) Wikisyntax for the Monastery}	[reply] [d/l]

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Re^5: Filtering Output from two files
by LanX (Saint) on Feb 05, 2018 at 15:10 UTC

> It is me who posted anonymously

I'm glad you are making progress. :)

> I didn't get where I missed "sigil $ in line once".

$hash{line}=1;  
# should be
$hash{$line}=1;
[download]

> Use of uninitialized value in line 34

You probably parse empty lines resulting in undefined variables.

Skip them with next , compare Re: Filtering Output from two files

> after the loop

The print belongs inside the loop.

please use code tags and indentation in your next post.

Cheers Rolf
_{(addicted to the Perl Programming Language and ☆☆☆☆ :)

Wikisyntax for the Monastery}

[reply]
[d/l]