NAME
    getenv - get an environment variable

SYNOPSIS
    getenv(env)

TYPES
    env		str

    return	str or nil

DESCRIPTION
    This function returns the value of the environment variable named by
    the string env.  If no such environment variable exists, nil is returned.

EXAMPLE
    > putenv("name", "value")
	    0
    > getenv("name")
	    "value"
    > putenv("name=val2")
	    0
    > getenv("name")
	    "val2"
    > isnull(getenv("unknown"))
	    1

LIMITS
    none

LIBRARY
    none

SEE ALSO
    putenv