There is a proper tool that is probably the best solution. They cut so that it does not smash the ends or the metal inside of the housing. Many also have an awl in order to help reform the end if any smashing or deformation does occur.
Most look something like this:
It is also possible with a brand new razor blade but the proper plier like tool makes it a lot more quick and easy.
For hydraulic hoses they differ slightly because of the difference in hose material, there are two type of hydraulic hose cutters, one that looks a bit like a pill cutter such as this:
Or the handheld variety that function quite similar that looks like this: