find big file

#!/bin/bash
 
#command usage description
function usage()
{
	echo -e "Usage:nt$0 DIR_NAME"
	exit
}
 
# Check if user is root
if [ $(id -u) != "0" ]; then
    echo "Error: You must be root to run this script, please use root to use it!!!"
    exit 1
fi
 
#judge the argv
if [ $# -ne 1 ]
then
	echo "the usage of the command is ERROR!!!"
        usage
fi
 
dir_name=$1
i=0
 
if [ ! -d $dir_name ]
then
	echo "the argv is not a direction!!!"
	usage
else
	cd $dir_name
	echo "pwd: " `pwd`
	du -ahS | sort -nr |
	while read line
	do
		myline=`echo $line | awk '{print $2}'`
		if [ -f $myline ] && [ $i -lt 5 ]
		then
			echo $line
			let i++
		fi
	done
fi
#!/bin/bash
 
#command usage description
function usage()
{
	echo -e "Usage:nt$0 DIR_NAME"
	exit
}
 
# Check if user is root
if [ $(id -u) != "0" ]; then
    echo "Error: You must be root to run this script, please use root to use it!!!"
    exit 1
fi
 
#judge the argv
if [ $# -ne 1 ]
then
	echo "the usage of the command is ERROR!!!"
        usage
fi
 
dir_name=$1
i=0
 
if [ ! -d $dir_name ]
then
	echo "the argv is not a direction!!!"
	usage
else
	cd $dir_name
	echo "pwd: " `pwd`
	du -ahS | sort -nr |
	while read line
	do
		myline=`echo $line | awk '{print $2}'`
		if [ -f $myline ] && [ $i -lt 5 ]
		then
			echo $line
			let i++
		fi
	done
fi