test for exponential,lognormal and gammadistribution

hello!
i don't want to test my sample data for normality, but exponential- lognormal- 
or gammadistribution.
as i've learnt the anderson-darling-test in R is only for normality and i am 
not supposed to use the kolmogorov-smirnov test of R for parameter estimates 
from sample data, is that true?
can you help me, how to do this anyway!
thank you very much!
nadja