matching two files and print together the inputs

vis1982 has asked for the wisdom of the Perl Monks concerning the following question:

If u have a file</>

FILE A

Beck 2

Ron 4

Test 5

Zid 6

FILE B

Ron 3

Zid 15

Steve 5

Beck 6

check 4

Test 6

So output shud be while comparing two files

Beck 2 6

Ron 4 3

Test 5 6

Zid 6 15

#!/usr/bin/perl
use strict;        
use warnings;

open(my $fh1,"$ARGV[0]") or die "Unable to open file1:$!";
my @array1=<$fh1>;
close($fh1);
chomp @array1;

my %hash;
@hash{@array1} = undef;

my $pattern = join ('|', @array1);

open(my $fh2,"$ARGV[1]") or die "Unable to open file2:$!";;

for my $line (<$fh2>)
{
    chomp $line;
    if ($line =~ /($pattern)/) {
    }
}
close($fh2);
[download]

what can be print command line to get this output? Thanks

Comment on matching two files and print together the inputs Download Code

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Re: matching two files and print together the inputs by Corion (Patriarch) on May 26, 2010 at 19:41 UTC
See match and count the number of times, or ask your teaching assistant.	[reply]
Re: matching two files and print together the inputs by ww (Archbishop) on May 26, 2010 at 20:58 UTC
vis1982: take a look at the questions you've asked. There seems to be a theme. Instead, take advantage of the way the Monastery is structured to help you learn; not merely to turn in completed homework/assignments/exercises. In order, I suggest: The hints below the text-input-box, "Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data! (Emphasis added: DATA!) On asking for help, How do I post a question effectively?,Writeup Formatting Tips and Markup in the Monastery Our magnificent Tutorials section. Super Search	[reply]
Re: matching two files and print together the inputs by kennethk (Abbot) on May 26, 2010 at 19:48 UTC
Although you could to it with a single pass, I would recommend breaking this into three steps: Read file 1 and store the contents in a hash Read file 2 and store the contents in a second hash Compare the hash keys and output keys that are present in both files An algorithm for the last step is outlined in a FAQ: How do I compute the difference of two arrays? How do I compute the intersection of two arrays?. I would do something along the lines of: `#!/usr/bin/perl use strict; use warnings; open(my $fh1, '<', "$ARGV[0]") or die "Unable to open $ARGV[0]:$!"; my %hash1; for (<$fh1>) { chomp; my ($key,$value) = split /\s+/, $_, 2; $hash1{$key} = $value; } open(my $fh2, '<', "$ARGV[1]") or die "Unable to open $ARGV[1]:$!"; my %hash2; for (<$fh2>) { chomp; my ($key,$value) = split /\s+/, $_, 2; $hash2{$key} = $value; } for my $key (keys %hash1) { next unless exists $hash2{$key}; print "$key $hash1{$key} $hash2{$key}\n"; }` [download] Note the addition of `'<'` to your open statements - this is an important habit to get into for security reasons. Also note that wrapping your input file contents in `<code>` tags can be just as important as wrapping your code in them.	[reply] [d/l] [select]
Re: matching two files and print together the inputs by suhailck (Friar) on May 27, 2010 at 04:47 UTC
An awk solution `awk 'NR==FNR{a[$1]=$2;next}$1 in a{print $1,a[$1],$2} ' fileA fileB` [download] ~suhail	[reply] [d/l]