This function deletes the file called file-name. When called interactively file-name is prompted for.
This function attempts to change the name of the file new-name to new-name.
This won’t work from one file system to another or if a file called new-name already exists, in these cases an error is signalled.
This prompts for its arguments when called interactively.
Creates a new copy of the file file-name with the name destination-name.
The access modes of the new file will be the same as those of the original file.
The arguments are prompted for when this function is called interactively.