NAME
    putenv - set the value of an environment variable

SYNOPSIS
    putenv(env [,val])

TYPES
    env		str
    val		str

    return	int

DESCRIPTION
     This function will set or change the value of an environment variable.
     Zero is returned if the environment variable was successfully set,
     otherwise a non-zero result is returned.

     When called with 1 arg, env must be a string of the form:

	    "envname=envval"

     This sets the environment variable "envname" to the value "envval".

     The 2 arg form is equivalent to:

	    putenv(strcat(env, "=", val))


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

LIMITS
    With 1 arg, env must contain at least 1 '=' character.

LIBRARY
    none

SEE ALSO
    getenv