How to find out line-endings in a text file?
You can use the file utility to give you an indication of the type of line endings.
Unix:
$ file testfile1.txttestfile.txt: ASCII text"DOS":
$ file testfile2.txttestfile2.txt: ASCII text, with CRLF line terminatorsTo convert from "DOS" to Unix:
$ dos2unix testfile2.txtTo convert from Unix to "DOS":
$ unix2dos testfile1.txtConverting an already converted file has no effect so it's safe to run blindly (i.e. without testing the format first) although the usual disclaimers apply, as always.
Ubuntu 14.04:
simple cat -e <filename> works just fine.
This displays Unix line endings (\n or LF) as $ and Windows line endings (\r\n or CRLF) as ^M$.
In vi...
:set list to see line-endings.
:set nolist to go back to normal.
While I don't think you can see \n or \r\n in vi, you can see which type of file it is (UNIX, DOS, etc.) to infer which line endings it has...
:set ff
Alternatively, from bash you can use od -t c <filename> or just od -c <filename> to display the returns.