Check difference between a file in a current directory and its backup file in backup directory created by backer.sh.

Backdiffer.sh

#!/bin/bash
#$Id: Backdiffer.sh,v 1.3 2013-12-07 12:48:18+09 shirai Exp shirai $

Backdiffer(){
	check_options $@
	check_dir
	counter=(`ls $BackDir | wc -w`)
	DiffFile="${BackDir}/$((counter-1))_${ArgFile}"
	CheckFile="$DiffFile"
	while true
	do
		if [ -f $CheckFile ];then
			DiffFile="${CheckFile}"
			((counter++))
			CheckFile="${BackDir}/${counter}_${ArgFile}"
		else
			break
		fi
	done
	diae diff $ArgFile $DiffFile
}

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

Options:
  args  input transcript text files
  -h    call this statement
  -d	dot dirname mode
"
	if [ $# = 0 ];then
		echo "$usage_msg"
	fi
	
	NumOpt=0
	DotMode=0
	while getopts hd option
	do
		case "$option" in
		h)
			echo "$usage_msg"
			exit 0
			;;
		esac
	done
	shift $NumOpt
	ArgFile=$1
	BackDir="${ArgFile}.dir"
}

check_dir(){
	if [ ! -f "$ArgFile" ];then
		echo " PLEASE INPUT A FILE NAME"
		exit
	fi
	if [ -d $BackDir ]; then
		DotMode=0
	elif [ -d back/$BackDir ]; then
		DotMode=1
		BackDir="back/$BackDir"
	else
		echo " backer directory was not found."
		exit
	fi
}

mkdir_idne(){
	if [ ! -d $1 ]; then
		mkdir $1
		echo "---> $1 was created."
	fi
}

diae(){
	echo $@
	$@
}

Backdiffer $@