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#my @command = ("su - $user -c id")  
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#system ("su - $user"); #this Works#
...
#system ("su - $user -c /bin/bash -c $action");
#system "sudo","su","-" => $user, -c =>  $action;

use warnings;
use diagnostics;
...
say "$user";
say "$action ";
print $sh->sudo("su -l - $user --command $action");