I am trying to run bash on heroku to test it out and it is failing
$ heroku run bash ▸ Error: No app specified ▸ Usage: heroku run --ap
Try this command:
heroku pg:psql -a appname
I think you have two issues.
Firstly, you need to run bash within some app. You can either specify the app via the --app key as the help actually says or you can run this command inside the folder which has a heroku app initialized already. For connecting the folder to a heroku app - see this answer How to link a folder with an existing Heroku app.
Second, running a bash actually takes away one dyno from your app. So you need to have at least one dyno.
Try run commands:
First you need to login, then you to see your apps and finally run bash
$heroku login
Insert you user and password
$heroku apps
=== user@gmail.com Apps
myaplication
then look at the list aps and write
$heroku run bash --app myaplication