I think Corion's method is more suitable for me :-)

But I find a "bad" way to make it, and I think this way is more efficient in mem and time :-(

File: main.pl => the main source file

require "all_hashes.pl";       # read in all the hashes
our $item = "Perl";            # this $item must be global  :-(
require "template.pl";         # perl interpolates all the variable

print $out;                    # $out is defined in template.pl
#...
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File: template.pl

my $out = "-p $act1{$item} -p $act2{$item} ...";
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File: all_hashes.pl => the file contains all the hashes

my %act1 = (
           "food"  => "eat it",
           "drink" => "drink it",
           "Perl"  => "play it");
my %act2 = (
           "food"  => "prepare it",
           "drink" => "be drunk",
           "Perl"  => "write it");
#...
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It's bad, hardcoded and has many global variables, however, a simple and fast way :-(