php artisan config:cache producing an e (laravel)

I am ruuning the below command at laravel:

root@vmi194229:/var/www/html# php artisan config:cache
Configuration cache cleared!
e
Configuration cached successfully!
root@vmi194229:/var/www/html# 

However the config cache got cleared, but produced an "e" in the terminal. Why the e is coming !?

via Chebli Mohamed