Unix format or Dos format

 If you need which format is it you can use editor vi.

for checking: file 1.txt

1) cat 1.txt

[root@localhost ~]# cat 1.txt

you are good linux guy

[root@localhost ~]#

2)  please use editor vi

vi 1.txt

-in normal mode:

:set ff?

like this:

3) check this: 

See: http://cpaul.is-programmer.com/posts/24738.html