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( my $name = $ARGV[0] ) && length $ARGV[0] > 2 or die "Usage: `$0 <nam
+e>` (min. 3 letters)";

my $name = $ARGV[0]

&& length $ARGV[0] > 2

while ( 1 ) { # runs forever
    ...
...
if ( foo() ) { # only runs if foo() returns something
    ...
}