If you want to show exact commands, I think you can use html code blocks. Unfortunately, WordPress converts double dashes into a single em dash character (em dashes are the width of an m character, en dashes are the width of an n character).
For example, if you type
<code>--flag</code>
Wordpress will display
--flag
You can also use back ticks in place of the code tags.
If you want to show a command line, please put try the code tags.
