sed 's/$'"/`echo \\\r`/" # Command line under bash.
sed "s/$/`echo -e \\\r`/" # Command line under ksh.
sed "s/$/`echo \\\r`/" # Command line under zsh.
sed 's/$/\r/' # gsed 3.02.80.
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===== In DOS Environments =====
sed "s/$//" # Method 1.
sed -n p # Method 2.