[d4rky]

Instead of using open you can just run the binary inside Slack.app directory:

SLACK_DEVELOPER_MENU=true /Applications/Slack.app/Contents/MacOS/Slack

[ak217]

That's not a great idea. If you don't use open, the app won't show up in the Finder app switcher.

[christefano]

Good point! Thanks for mentioning that.

Small nitpick, though. The dock is what runs the app switcher, not the Finder.

[xenophonf]

That only works for the Bourne shell. Using `env` is more portable.