Bash: AWK Arimet

Operaciones ariméticas con variables de coma flotante

awk "BEGIN {print $ul_mean+(2*$ul_st); exit}"

uthr=$(awk "BEGIN {print $ul_mean+(2*$ul_st); exit}")

awk '{ $1 = $2 + $3 / $4; print }' inventory-shipped

The arithmetic operators in awk are:

x + y Addition.

x - y Subtraction.

• x Negation.

• x Unary plus. No real effect on the expression.

x * y Multiplication.

x / y Division. Since all numbers in awk are double-precision floating point, the result is not rounded to an integer: 3 / 4 has the value 0.75.

x % y Remainder. The quotient is rounded toward zero to an integer, multiplied by y and this result is subtracted from x. This operation is sometimes known as "trunc-mod." The following relation always holds:

b * int(a / b) + (a % b) == a

One possibly undesirable effect of this definition of remainder is that x % y is negative if x is negative. Thus,

-17 % 8 = -1

In other awk implementations, the signedness of the remainder may be machine dependent. 

x ^ y

x ** y

Exponentiation: x raised to the y power. 2 ^ 3 has the value 8. The character sequence **' is equivalent to ^'. (The POSIX standard only specifies the use of `^' for exponentiation.)