#!/bin/sh
# rmcr: remove carriage returns *in place* from a file with CRLF text.
# Copyright 2010 David Egan Evans
#
# This software is provided 'as-is', without any express or implied
# warranty. In no event will the authors be held liable for any damages
# arising from the use of this software.
#
# Permission is granted to anyone to use this software for any purpose,
# including commercial applications, and to alter it and redistribute it
# freely, subject to the following restrictions:
#
# 1. The origin of this software must not be misrepresented; you must
# not claim that you wrote the original software. If you use this
# software in a product, an acknowledgment in the product documentation
# would be appreciated but is not required.
#
# 2. Altered source versions must be plainly marked as such, and must 
# not be misrepresented as being the original software.
#
# 3. This notice may not be removed or altered from any source distribution.

tmp="/tmp/.$$"
if test "$#" -eq 1
then
	if test -w $1
	then >$tmp && chmod 600 $tmp
		if <$1 tr -d '\r' >$tmp
		then trap '' 1 2 15
			cp $tmp $1
		fi
		rm -f $tmp
	else echo "File is not writable or does not exist!" 1>&2; exit 2
	fi
else echo "usage: rmcr file" 1>&2; exit 3
fi