You can also use %ENV to send/retrieve information to the child script (example follows)

script1.pl

#!/usr/bin/env perl
# script1.pl

$ENV{'MY_NAME'} = 'script1';

print system('./script2.pl', 'arg'), "\n";
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script2.pl

#!/usr/bin/env perl
# script2.pl

print $ENV{'MY_NAME'}, "\n";
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