Execution problem with shell script for modifying a user

Shell Programming and Scripting
1 
#/bin/sh
echo "enter the user name"
read $username
echo "Enter new home directory"
read $newhd
usermod -d $newhd $username ;;

error while executing :

enter the user name
Rev
Enter new home directory:
/home/58745
usermod: option requires an argument -- 'd'
Try `usermod --help' or `usermod --usage' for more information.

If i try usermod -d /home/58745 Rev in the command line, it is wirking fine.. but in the script, it is displaying usermod: option requires an argument -- 'd' error.

Could anybody please help me out in this issue......

2 
#/bin/sh 
echo "enter the user name" 
read username 
echo "Enter new home directory" 
read newhd 
usermod -d $newhd $username
3

Thanks for your reply.... it is working fine