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