Convert DOS/Windows newlines (CRLF) <-> Unix newlines (LF)

Convert DOS/Windows newlines (CRLF) to Unix newlines (LF).

sed -i 's/.$//' file

Convert Unix newlines (LF) to DOS/Windows newlines (CRLF).

sed -i "s/$/`echo -e \\\\\\r`/" file

REFERENCES:
http://www.catonmat.net/blog/sed-one...ined-part-one/
http://www.catonmat.net/blog/awk-one...ined-part-two/