troubleshooting Question

What is this symbol mean in perl

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What is this symbol mean in perl

use Net :: FTP // what is use and :: mean

my $TRUE=1     // what is my mean

if (not -e $writetofile) //what -e mean here

foreach $morse1 (@food) {
  eval {   //What is eval mean

if ($@)  //What is $@ mean?

$ftp->login() // what is "->" mean  

chomp;         //what this mean
s/#.*//;       //what this mean
s/^\s+//;      //what this mean
s/\s+$//;      /what this mean    
next unless length;   //what this mean
my ($var,$value)=split(/\s*=\s*/,$_,2); //what this mean
$Configuration{$var}=$value; //is this associative array??

$stmtcompnumber=$dbh->prepare($a); //what is perpare for
$stmtcompnumber->bind_param(1,$$b); //what is bind_param and parameter 1 for

$a .= "\"$arow[0]\"|";  //what is this use for?
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