#!/bin/bash
# This script is used to remove the specified characters from the filename.

# Test the command format
if [ -z "$3" -o $1 -gt $2 ];then
	echo "--Usage: `basename $0` number1 number2 filename filename ..."
	echo "	number1: is the position of the first character to be cut"
	echo "	number2: is the position of the last character to be cut, not less that number1"
	echo "	filename: you can specify more than one files or use wild card"
	exit 65
fi

# Allow more than one files to be specified once
while [ -n "$3" ];do
	if [ ! -e "$3" ];then
		echo "--Error: The file $3 does not exist"
	else
		oldname=`basename $3`
		echo $oldname > /tmp/file4rename
		newname=`colrm $1 $2 < /tmp/file4rename`
		if [ -n "$newname" ];then
			mv $3 `dirname $3`/$newname
			echo "--Info: The file $oldname has been renamed to $newname"
		else
			echo "--Error: You cannot do that"
		fi
	fi
	shift
done

# Remove the temporary file
rm -f /tmp/file4rename

exit 0