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I can run Google Chrome from the command line using $ google-chrome, but what flag can I pass to open it with developer console already open, preferably open to the console tab?
I checked the man page for google-chrome but it states that
Google Chrome has hundreds of undocumented command-line flags that are added and removed at the whim of the developers.
I'm hoping one of those undocumented flags does what I want.
A Google employee maintains this list of automatically updated Chromium flags. There doesn't seem to be a flag for opening Chrome with developer console open.
What exactly are you trying to achieve by that? If you are trying to run some kind of automated tests, you should try out PhantomJS.
Seems there is no such option. I added a feature request in Chrome product forum https://productforums.google.com/forum/#!category-topic/chrome/give-feature-feedback-and-suggestions/mac/Stable/3HYIAl8_ndc
The flag you're looking for is --auto-open-devtools-for-tabs. Please note, that you should quit Chrome before this setting will take effect.
This has worked at least since Chrome 55.0.2883.87 m (the latest version as of initial post)