In Perl, the increment operator ++ can be used to increment a number by one.
Here are some examples:
my $number = 5;
$number++; # increments $number by 1
print $number; # output: 6
$number += 3; # increments $number by 3
print $number; # output: 9
In the above example, the variable $number is initially set to 5. The ++ operator is then used to increment the value of $number by 1. The resulting value of $number is then printed to the screen.
In the second example, the += operator is used instead of ++ to increment the value of $number by 3. The resulting value of $number is then printed to the screen.