02-06-2010
I'm pretty new to Unix myself, so I checked in the GNU Coreutils documentation, and there is no infinity option there.
My only thought is that sleep is reading "infinity" as a large integer, rather than as a string.
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LEARN ABOUT OPENDARWIN
pow
POW(3) BSD Library Functions Manual POW(3)
NAME
pow -- power function
SYNOPSIS
#include <math.h>
double
pow(double x, double y);
DESCRIPTION
The pow() functions compute x raised to the power y.
SPECIAL VALUES
pow(+-0, y) returns +-infinity and raises the "divide-by-zero" floating-point exception for y an odd integer < 0.
pow(+-0, y) returns +infinity and raises the "divide-by-zero" floating-point exception for y < 0 and not an odd integer.
pow(+-0, y) returns +-0 for y an odd integer > 0.
pow(+-0, y) returns +0 for y > 0 and not an odd integer.
pow(-1, +-infinity) returns 1.
pow(1, y) returns 1 for any y, even a NaN.
pow(x, +-0) returns 1 for any x, even a NaN.
pow(x, y) returns a NaN and raises the "invalid" floating-point exception for finite x < 0 and finite non-integer y.
pow(x, -infinity) returns +infinity for |x| < 1.
pow(x, -infinity) returns +0 for |x| > 1.
pow(x, +infinity) returns +0 for |x| < 1.
pow(x, +infinity) returns +infinity for |x| > 1.
pow(-infinity, y) returns -0 for y an odd integer < 0.
pow(-infinity, y) returns +0 for y < 0 and not an odd integer.
pow(-infinity, y) returns -infinity for y an odd integer > 0.
pow(-infinity, y) returns +infinity for y > 0 and not an odd integer.
pow(+infinity, y) returns +0 for y < 0.
pow(+infinity, y) returns +infinity for y > 0.
A domain error occurs if x is finite and negative and y is finite and not an integer.
A domain error can occur if x is 0 and y less than or equal to 0.
Range errors may occur.
SEE ALSO
math(3), infnan(3)
STANDARDS
The pow() function conforms to ISO/IEC 9899:1999(E).
4th Berkeley Distribution July 12, 2003 4th Berkeley Distribution