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./program.pl -a param1 param2 -b param3 param4

#!/usr/bin/perl
use strict;
...
  
  #do stuff without parameters
}

my $param2 = shift @ARGV; #commented out in the code above

$perl program.pl -a param1_a param2_a -b param1_b param2_b

param1_a, param2_a, 
param1_b, param2_b,

$perl program.pl -b param1_b param2_b -a param1_a param2_a

param1_a, param2_b, 
param1_b, param2_a,