Reverse the String using Shell Programming-tips inside

clear
echo “Enter the string:-”
Read str
len =  `  $str  |  wc-w  `
while [  $len  –gt  0  ]
do
temp = ` $str | wt-c $ len `
rev= `  $rev $temp  `
len=  ` expr $len-1 `
done
echo “The reversed string is :-   $rev”