You’ll also need to give it execute permissions for the user who will execute the bash script. So, if it’s the logged in user, cd to the directory where cosway resides and simply type:
$ sudo chown $USER cosway
If you want to ensure it has permissions for the user, you, to execute simply type the following in immediately after the above command finishes execution:
$ sudo chmod 700 cosway
Immediately after you should be able to execute the bash script from the command line but make sure the script is from a reputable source before giving it priveleges to do anything it likes.