#!/bin/ksh
if [ $# == 0 ]
then
# do basic search in current directory
    ls -la | sort +4 -5 -n -r | head -5
elif [ -n "$3" ]
then
# if $3 is non-empty, bad operation
    echo "hotshell: illegal option or usage"
    echo "Usage: hquota [-r] [directory]"
elif [ "$1" != "-r" -a ! -d "$1" ]
then
# not a valid operation
    echo "hotshell: illegal option or usage"
    echo "Usage: hquota [-r] [directory]"
elif [ -d "$1" ]
then
# basic search in given directory
    ls -la $1 | sort +4 -5 -n -r | head -5	
elif [ "$1" = "-r" -a -z "$2" ]
then
# recursive search from current directory
    ls -Rla | sort +4 -5 -n -r | head -5
elif [ "$1" = "-r" -a -n "$2" ]
then
# recursive search through given directory
    ls -Rla $2 | sort +4 -5 -n -r | head -5
fi