I'm not aware of an O_DIRECT version of cat. The (older) GNU cat (GNU coreutils 0.83) I just looked at doesn't seem to support it. There is however GNU dd whi

I'm not aware of an O_DIRECT version of cat. The (older) GNU cat (GNU coreutils 0.83) I just looked at doesn't seem to support it. There is however GNU dd which supports direct i/o ('direct' flag) for ages.