UNIX® Shells by Example, Third Edition

7.11. Built-In Arithmetic Functions

Table 7.3 lists the built-in arithmetic functions, where x and y are arbitrary expressions.

Table 7.3. Arithmetic Functions

Name	Value Returned
atan2(x,y)	Arctangent of y/x in the range.
cos(x)	Cosine of x, with x in radians.
exp(x)	Exponential function of x, e.
int(x)	Integer part of x; truncated toward 0 when x > 0.
log(x)	Natural (base e) logarithm of x.
rand( )	Random number r, where 0 < r < 1.
sin(x)	Sine of x, with x in radians.
sqrt(x)	Square root of x.
srand(x)	x is a new seed for rand( ).[a]

^[a] From Alfred V. Aho, Brian W. Kernighan, and Peter J. Weinberger, The AWK Programming Language (Boston: Addison-Wesley, 1988).© 1988 Bell Telephone Laboratories, Inc. Reprinted by permission of Pearson Education, ...