perl post condition

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perl post condition - 

# Basic syntax:
statement if condition;
statement unless condition;

# Example usage:
my $x = 3;
my $y = 5;
# run the statement on the left only if the statement on the right is true
print "x is less than y\n" if $x < $y;
--> x is less than y

# run the statement on the left only if the statement on the right is false
print "x is less than y\n" unless $x > $y;
--> x is less than y

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