Under limited circumstances, you could use $_ as an iterator, as described in perlvar:
The default iterator variable in a foreach loop if no other variable is supplied. 
use strict;
use warnings;

for (1..5) {
    print 2 * $_, " ";
}
print "\n";

__END__
2 4 6 8 10

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In reply to Re: Is there a Perl variable to count iterations in a loop? by toolic
in thread Is there a Perl variable to count iterations in a loop? by pat_mc

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