cat filename | tr '[:uper:]' '[:lower:]' > newfilename
or
cat filename | tr [:uper:] [:lower:] > newfilename
cat filename | tr '[:uper:]' '[:lower:]' > newfilename
or
cat filename | tr [:uper:] [:lower:] > newfilename
Using Emacs
Esc-x, replace-string Ctrl-q, Ctrl-M, Enter, Enter
Using the terminal
sed -e “s/^M//” filename > newfilename