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09.28.2006 at 06:16AM PDT, ID: 22006003
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perl - compare two files

Tags: perl, files, two, compare
I need a easy way to compare two files, I have a small perl script that I works for this but doesn't work
when the cases are different in the files, tried putting in to ignore the case but doesn't seem to work.


What I need to do is to compare file1.txt and file2.txt and print out any names that are in file1 that is not in
file2 while ignoring the case as sometimes one file will have all caps and sometimes will start with caps.

Ex: of two files I need to compare, while printing out any names that are in file1 but not in file2

file1.txt

pilot2
SBoulard32
volondat7
WDong23
woods2
HRaybaud4
alecossais6
barakat5
edomergue1
belghiti1
bellan1


file2.txt
Pilot2
SBOULARD32
WDong23
WOODS2
HRaybaud4
barakat5
belghiti1
BELLAN1


Thanks,
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Question Stats
Zone: Programming
Question Asked By: bt707
Solution Provided By: Morcalavin
Participating Experts: 2
Solution Grade: A
Views: 53
Translate:
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09.28.2006 at 06:35AM PDT, ID: 17619049

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09.28.2006 at 06:48AM PDT, ID: 17619173

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09.28.2006 at 06:51AM PDT, ID: 17619198

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09.28.2006 at 06:53AM PDT, ID: 17619223

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09.28.2006 at 07:15AM PDT, ID: 17619433

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09.28.2006 at 06:35AM PDT, ID: 17619049
Bt,
If I am reading this right, can't you just lowercase both sides of your conditional name check?

open ONE, $filename1;
open TWO, $filename2:

while (my $line1 = <ONE>) {
  my $value1 = lc($line)
  while (my $line2 = <TWO>) {
     my $value2 = lc($line)
     if ($value1 eq $value2) {
        #compare matched
     }
  }
}


just a quickie might not do exactly what you are looking for but its a start.

G
 
09.28.2006 at 06:48AM PDT, ID: 17619173
Glowman,

I can't convert either file to lower case in this case, I need to use the same case that is in the file to be able to proceed with the next
things I need to do which has to match the case. Sorry I forgot to mention that, I did already do that then realized that's going to lead to a problem.

Thanks
 
09.28.2006 at 06:51AM PDT, ID: 17619198
BT,
you wouldn't actually be converting the value within the file to lowercase, just the temp variable that is holding the value from the file, you could still print out in the original case when your conditions matched.  Just print $line1 instead of $value1  By changing the variable to lower case, or upper case you can compare them.  

Watching..
 
09.28.2006 at 06:53AM PDT, ID: 17619223
open(FILE1, "<file1.txt");
@file1 = <FILE1>;
close(FILE1);
open(FILE2, "<file2.txt");
@file2 = <FILE2>;
close(FILE2);

foreach $line(@file1) {
      chomp($line);
      unless(grep(/$line/i, @file2)) {
            print "$line\n";
      }
}
Accepted Solution
 
09.28.2006 at 07:15AM PDT, ID: 17619433
Thanks Morcalavin, worked just fine.

Thanks again!
 
 
20080236-EE-VQP-29