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Re: comparing 2 files and creating third file with uncommon content

by 2teez (Priest)
on Jun 18, 2014 at 14:26 UTC ( #1090313=note: print w/ replies, xml ) Need Help??


in reply to comparing 2 files and creating third file with uncommon content

Hi rashichauhan,

Code is not working.A new file is genertaed but consist of only last element of first file.Plz help me in this regard.

Use an hash and cut the chase on using for loops.
Open the first file and read line by line, then on each line split on space, use those as your key/value of the hash.Then open the second file, step through it, one after the other, splitting on each line too. Then use the word to check if such exist in your hash, if so print it to the file you want and if not print it to another one.

Something like this will do.

#!/usr/bin/perl -l use warnings; use strict; use Inline::Files; my %file1; while (<FILE1>) { next if /^\s+$/; my ( $key, $value ) = split; $file1{$key} = $value; } my $str_union; my $str_inter; while (<FILE2>) { next if /^\s+$/; my ( $key, $value ) = split; if ( $file1{$key} ) { $str_union .= $_; } else { $str_inter .= $_; } } print "This goes to File 3\n", $str_union, "\nThis goes to File 4\n", $str_inter; __FILE1__ EC:1.1.1.42 isocitratedehydrogenase EC:1.1.1.44 6-phosphogluconatedehydrogenase EC:1.1.1.49 glucose-6-phosphate1-dehydrogenase __FILE2__ EC:1.1.1.42 isocitratedehydrogenase EC:1.1.1.44 6-phosphogluconatedehydrogenase EC:1.1.1.49 glucose-6-phosphate1-dehydrogenase EC:1.11.1.9 glutathioneperoxidase EC:2.5.1.16 spermidinesynthase EC:6.3.1.8 glutathionesynthase

Note: Though this code works, but it just to show the concept am describing. On a 'good' day since the two while loops "smell" the same one can 'string' them together in a way to avoid DRY
Hope this helps.
If you tell me, I'll forget.
If you show me, I'll remember.
if you involve me, I'll understand.
--- Author unknown to me


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