ruby-on-rails - Heroku Bash: ls コマンドで .dat ファイルが表示されない

Question

I am storing some .dat files in the public folder of my rails app on heroku. However, I cannot display those files in the heroku bash.

Notice the "total 4" in the ls -l result

~/public/files $ ls
README.txt

~/public/files $ ls -a
.  ..  README.txt

~/public/files $ ls -l
total 4
-rw------- 1 u5517 5517 25 2013-04-13 23:35 README.txt

So I know they are there, they are just not being shown. I need to be able to look at them to verify my app is working correctly.

Thanks.