log()
Returns a natural logarithm of the specified number. If a negative number is passed to the parameter, it returns NaN
(Not a Number). It returns null when it receives an argument value that is not a number.
Syntax
log(NUM_EXPR)
Required Parameter
NUM_EXPR
- Expression that returns int, short, long, float, or double.
Usage
json "{}" | eval log=log(10) => 2.302585092994046