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diff --git a/tools/unix2dos b/tools/unix2dos
new file mode 100755
index 0000000..31fa7c6
--- /dev/null
+++ b/tools/unix2dos
@@ -0,0 +1,22 @@
+#!/bin/sh
+
+# An implementation of unix2dos using sed.
+# Written by Charles McGarvey; released into the public domain.
+
+if [ -f "$1" ];
+then
+	TMPFILE="$1.$$"
+	sed 's/\r*$/\r/' "$1" >$TMPFILE
+	if [ ! "$2" ];
+	then
+		cp -f "$TMPFILE" "$1"
+	else
+		cp -f "$TMPFILE" "$2"
+	fi
+	rm -f "$TMPFILE"
+else
+	echo "`basename $0` infile [outfile]"
+	echo "  convert a file from unix to dos file format"
+	exit 1
+fi 
+