Interoperability note: Windows inherits from DOS -- filenames that end in dot are indistinguishable from filenames with no ending dot:

D:\PerlMonks>echo>message. This is a test.

D:\PerlMonks>dir

 Directory of D:\PerlMonks

04/22/2015  11:12 PM    <DIR>          .
04/22/2015  11:12 PM    <DIR>          ..
04/22/2015  11:12 PM                17 message

D:\PerlMonks>echo>message This is a test.

D:\PerlMonks>dir

 Directory of D:\PerlMonks

04/22/2015  11:12 PM    <DIR>          .
04/22/2015  11:12 PM    <DIR>          ..
04/22/2015  11:12 PM                17 message

D:\PerlMonks>echo>"message." This is a test.

D:\PerlMonks>dir

 Directory of D:\PerlMonks

04/22/2015  11:12 PM    <DIR>          .
04/22/2015  11:12 PM    <DIR>          ..
04/22/2015  11:12 PM                17 message

D:\PerlMonks>
[download]

The nit: Under Windows, message.and messageneed to be in the same category.