Perl doesn't know echo only print
What you seem to want is open with a pipe-symbol¹ to write to awk's STDIN.
Calling awk from Perl is somehow strange, though, Perl was primarily designed to replace awk and sed .
update
if you just wanna pass a handful of variables better use arguments in backticks
my $result = `awk $var1 $var2`;
but I don't know much about awk (cause I don't need to ;-)
Cheers Rolf
(addicted to the Perl Programming Language)
¹) like in
open(my $awk, "|awk >Tmp$$") # $$ is our process id
or die "Can't start awk: $!";
print $awk $var1, $var2;
close $awk;
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