As you've learned, Linux commands use options to create variations of a command. Describe ?the rules for grouping letter arguments.

What will be an ideal response?

 Linux commands use options to create variations of a command. There's no difference between grouping letter arguments (such as l and a) after a single - or entering them separately. Therefore, ls -la functions the same as ls -l -a. Arguments consisting of multiple letters must be preceded by two -- characters instead of one and can't be grouped together, as in ls --all. ?