Hi monks, I have a code that reads like this: 

my %csahash;

my $line=<>;

while($line=<>){

if($line=~ /\b(\d\w{3})\b/){

$csahash{$1}++;

}


}

[download]

and the ouput is this: 

2buf= 48
1lsj= 6
2bp7= 12
1ye6= 36
8icc= 1
1a2n= 4
1lz6= 2
1pw1= 5
1e4d= 4
2f8j= 28
1iw8= 24
1qbd= 2
1kf4= 7
1z53= 3
1gxx= 2
1dd6= 10
1ke5= 10
2og7= 1

[download]

I have a very similar %hash like this: 

%cathhash;

my $line2=<>;

while($line2=<>){

if($line2=~/\b(\d\w{3})\b/){

$cathhash{$line2}++;

}

}

[download]

which will print out very similar output. My question is to see which of those id nos match between the hashs and give me a print out of the matches preferabaly. Thanks. A.

Ok many thanks for both ur tips. My code now looks like this : 

my %csahash;

my $line=<>;

while($line=<>){

if($line=~ /\b(\d\w{3})\b/){

$csahash{$1}++;

}


}


%cathhash;

my $line2=<>;

while($line2=<>){

if($line2=~/\b(\d\w{3})\b/){

$cathhash{$line2}++;

}

}



foreach my $key(keys %csahash){

if(defined $cathhash{$key}){

print "$key matches. It's values are $csahash{$key} and $cathhash{$key
+}\n";

}
}

[download]

but when I try to execute it on the command prompt like this :

perl pl.pl csa.txt cath.txt I get nothing just a blank cursor. do I have to do something with cntrl+D? I am bit new to perl so am having teething problems. Many thanks. Ok, thanks again but when I run this code through I still get no print out, can someone tell me where I'm going wrong in my execution?

In reply to hash question by ada

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