si usano per convertire i files di testo creati in modo che siano portabili sia su unix che su dos
da unix a dos:
awk '{printf "%s\r\n", $0}' infile > outfile
da dos a unix:
tr -d \\r < infile > outfile
# per emacs:
(defun dos2unix ()
(interactive)
(goto-char (point-min))
(while (search-forward "\r" nil t) (replace-match "")))
# usando sed
# IN UNIX ENVIRONMENT: convert DOS newlines (CR/LF) to Unix format
sed 's/.$//'
# assumes that all lines end with CR/LF
sed 's/^M$//'
# in bash/tcsh, press Ctrl-V then Ctrl-M
sed 's/\x0D$//'
# gsed 3.02.80, but top script is easier
# IN UNIX ENVIRONMENT: convert Unix newlines (LF) to DOS format
sed "s/$/`echo -e \\\r`/"
# command line under ksh
sed 's/$'"/`echo \\\r`/"
# command line under bash
sed "s/$/`echo \\\r`/"
# command line under zsh
sed 's/$/\r/'
# gsed 3.02.80
# IN DOS ENVIRONMENT: convert Unix newlines (LF) to DOS format
sed "s/$//"
# method 1
sed -n p
# method 2
# IN DOS ENVIRONMENT: convert DOS newlines (CR/LF) to Unix format
# Cannot be done with DOS versions of sed. Use "tr" instead.
tr -d \r <infile >outfile
# GNU tr version 1.22 or higher