There is a convention of providing concise documentation of options in `<command> --help` and more verbose documentation of options in the man page. When you lo

There is a convention of providing concise documentation of options in `<command> --help` and more verbose documentation of options in the man page. When you look through a variety of common tools' documentation, you will notice that there are conventions that could almost be called a standard. But when you look carefully, you will find minor but important differences in how various tools write the options documentation -- enough to inhibit parsing it automatically.