The response of a shock front to arbitrary small perturbations can be calculated analytically. Such rippled shock front solutions are useful for determining the accuracy of hydrodynamic simulation codes such aslasnex[Comments Plasma Phys. Controlled Fusion2, 51 (1977)], which are used to compute perturbation growth in inertial fusion targets. Thelasnexfractional errors are of order &kgr;2L2, where &kgr; is the transverse wavenumber of the perturbation, andLis the largest zone dimension. Numerical errors are about 25% for a calculation using 26 zones per transverse wavelength.