heroku run bash is not working

Question

Why is heroku run bash not working?

$ heroku login

Enter your Heroku credentials.
Email: [email protected]
Password (typing will be hidden): 
Logged in as [email protected]

$ heroku run bash

 ▸    No app specified.
 ▸    Run this command from an app folder or specify which app to use with --app APP

$ heroku run --app bash

 ▸    Usage: heroku run COMMAND
 ▸    
 ▸    Example: heroku run bash

$ heroku run "ls /usr/bin/"

 ▸    No app specified.
 ▸    Run this command from an app folder or specify which app to use with --app APP

$ heroku run --app "ls /usr/bin/"

 ▸    Usage: heroku run COMMAND
 ▸    
 ▸    Example: heroku run bash

$ heroku version

heroku-toolbelt/3.42.22 (universal.x86_64-darwin15) ruby/2.0.0
heroku-cli/4.27.11-7569c5d (amd64-darwin) go1.5.2
=== Installed Plugins
[email protected]
[email protected]
[email protected]
[email protected]
[email protected]
[email protected]
[email protected]
[email protected]

Answer 1

As the error message indicates, you need to specify which heroku app you want to run commands on. (If you're in a git repository with a remote pointing to heroku, it will use that one by default; that's what it means by "from an app folder".)

$ heroku apps

will give you a list.

$ heroku run --app INSERT_APP_NAME_HERE bash

will run bash on that app.