rewrite.sh

#!/bin/bash
#$Id: rewrite.sh,v 1.10 2014-01-08 14:09:47+09 shirai Exp $

rewrite(){
	all=()
	check_options $@
	file="${all[$((${#all[@]}-1))]}"
	file_check $file
	tmp="TEMP_${file##*/}"
	${all[@]} > $tmp
	if [ $SaveTimeStamp = 1 ]; then
		touch -r $file $tmp
	fi
	if [ -x $file ]; then
		chmod +x $tmp
	fi
	if [ $? = 0 ];then
		mv $tmp $file
		echo "---> $file was rewriten"
	else
		echo " $0 was failed"
		rm $tmp
	fi
}

check_options(){
usage_msg="\
Usage: $0 [options] files

Options:
  -h		show this help
  -s		save time stamp
"
	
	SaveTimeStamp=0
	while getopts hs option
	do
		case "$option" in
		h)
			echo "$usage_msg"
			exit 0
			;;
		s)
			SaveTimeStamp=1
			;;
		\?)
			echo "Usage: $0 [-h] [-s] command files" 1>&2
			exit 1;;
		esac
	done
	shift `expr "$OPTIND" - 1`


	if [[ $# < 2 ]];then
		echo " PLEASE INPUT  COMMAND  AND  FILE" 1>&2
		echo "$usage_msg" 1>&2
		exit 1
	fi
	all=($@)
}

file_check(){
	file=$1
	if [ ! -f $file ]; then
		echo "$file does not exist."
		exit 1
	fi
}

rewrite $@