An operator that accepts a single operand is called a unary operator, and expressions built using unary operator are called unary expressions. Increment and decrement operators also fall under this category.
Unary plus:
It is represented by a single plus (+) symbol. It multiplies a single operand by +1. In the following example, we assign a variable p with value -5. On applying the unary plus operator to the variable, it multiplies the variable p with +1 and again stores the result inside p, as follows:
$ awk 'BEGIN{ p = -5; p = +p; print "p = ",p }'
The output on execution of the preceding code is as follows:
p = -5
Unary minus:
It is represented by a single minus (-) symbol. It multiplies a single operand by -1. In the following example, we assign a variable p with value -5. On applying the unary minus operator, it multiplies the variable...
