I understand them: I am an old Linux user, used to the command line. In there, once upon a time, a command has only on way to be called, and that way was the name under which the command was known and distributed. Aliases were a personal customization made by the user for his own amusement. I am still under the assumption that if a program is presented to you as X, then X is the command to type to run said program. But I understand this is now not as obvious, even in the Linux world.