Window -> Preferences -> General -> Workspace -> New text file line delimiter.
To convert existing files, open file for editing and for the currently edited file, go to the menu:
File -> Convert Line Delimiters To
and select Unix.
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To convert files from windows (or DOS) type line endings to UNIX or Mac flavor use “flip”
Convert DOS or Windows line endings to Unix or Mac
flip -d <filename>
Convert Unix line endings to Windows
flip -u <filename>
To install flip on Mac:
sudo port install flip
To install flip on Ubuntu Linux
sudo apt-get install flip
How do you know your line endings are DOS or Windows flavor? Open your text file with a plain text editor. If you see a “^M” at the end of every line then your line endings are DOS/Windows.
From the flip Usage instructions
Usage: flip [-t|-u|-d|-m] filename[s] Converts ASCII files between Unix, MS-DOS/Windows, or Macintosh newline formats Options: -u = convert file(s) to Unix newline format (newline) -d = convert file(s) to MS-DOS/Windows newline format (linefeed + newline) -m = convert file(s) to Macintosh newline format (linefeed) -t = display current file type, no file modifications