Convert newline between systems

From Augix' Wiki

The new line characters are different in different operation systems. In order to convert them between systems, we should use the following command.

http://en.wikipedia.org/wiki/Newline

sed -e 's/$/\r/' inputfile > outputfile                # UNIX to DOS  (adding CRs)
sed -e 's/\r$//' inputfile > outputfile                # DOS  to UNIX (removing CRs)
perl -pe 's/\r\n|\n|\r/\r\n/g' inputfile > outputfile  # Convert to DOS
perl -pe 's/\r\n|\n|\r/\n/g'   inputfile > outputfile  # Convert to UNIX
perl -pe 's/\r\n|\n|\r/\r/g'   inputfile > outputfile  # Convert to old Mac
perl -pe 's/\r\n|\n|\r/\n/g'   inputfile > outputfile  # Convert to new Mac