Language Basics Perl

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  4. You have to tell Perl which packages you intend to use, with the use command
#  use packagename;
#  For example:
#  use File::Copy;
#!/usr/bin/perl -w
use File::Copy;
$input  = "text.txt";
$output = "text1.txt";
copy($input, $output) or die 
  "Can't copy $input to $output due to $!.";