That used to be a fairly common standard. You'll notice nearly all the old GNU / BSD tooling use this paradigm. It is even codified in GNU's coding principles. In fact, when you do that, you can even merge all the single character flags together. For example, I can type, `ls -lah` instead of `ls -l -a -h`. Pretty handy.

My pet peeve is commands not supporting -h for help and making me write --help. This is especially worse when the command already supports single character arguments.