[arch-general] tmpfs

Good day everyone, I want to delete the next two lines from my fstab: none /dev/pts devpts defaults 0 0 none /dev/shm tmpfs defaults 0 0 however I would like to know the secondary effects of doing such thing, all the information I could get on the internet is that shm is for POSIX shared memory support and that almost any program actually use it, for devpts I couldn't find much information about it. does anyone knows if it is safe to remove those lines from my fstab? thank you.