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Its PERL + Comma separated seventh field

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Top Forums Shell Programming and Scripting Its PERL + Comma separated seventh field
# 15  
Old 06-23-2009
Quote:
Originally Posted by ganapati
Hi,

I've another problem with the scope of array. I'm not able to print array elements (for 8th field) outside the loop. But I can print this within the loop.


Please suggest me.
Assuming I understand your real question/problem, try this:

Code:
open( my $in, '<', $inputfilename )
    or croak "Cannot open file '$inputfilename': $!";

my @new_array;
while ( my $line = <$in> ) {
  chomp $line;
  my @orig_array = split( /;/, $line ); 
  push @new_array, $orig_array[7];
}
  print "$_\n" for @new_array;

# 16  
Old 06-24-2009
PERL - handling billions of records in an array
Hi Kevin,

Thanks for your help. Your modification worked perfectly.

But, is there any way to avoid PUSH operation? since my file has more than 3-5 billions of records.

Regards,
Ganapati.
# 17  
Old 06-24-2009
You could write $orig_array[7] to a file inside the loop. Then open the file and read the file outside the loop.
# 18  
Old 06-24-2009
The problem with the printing in your original script was probably that the last record was empty (or newline or a blank or something). Your script was printing only the most recent record.

Kevin's suggestion is correct; but if you can't store 3-5 billions of records, then what exactly is your hope? Just print out the 8th column? If so, you could so:
Code:
cut -d \; -f 8

Of in perl:
Code:
perl -ne 'print (split(/;/))[7] . "\n";'

Last edited by otheus; 06-24-2009 at 05:06 PM.. Reason: need to escape the ; character
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