Shell Programming and Scripting

I got the below script on line but can't seem to get it to work as there are syntax errors where 'len' is shown. Can anyone help with this??

echo " Enter the String"
read str
echo $str > str.txt
len = 'echo $str | wc -c'
len = 'expr $len -1'
c= 0 , w = 0 , s = 0 , i = 1
echo " Length of string = $len"
w = 'echo $str | wc - w'
c = 'echo $str | wc -c'
while [ i -le $ len ]
do
st = 'cut - c$I str.txt'
if ["str" = " "] then
s = 'expr $s + 1'
fi
i = 'expr $i + 1
done
echo "Character = $c"
echo "Words = $w"
echo "Spaces = $s"

Welcome to unix.com forum.
i) Please read the forum rules before posting, and don't post homework's.
ii) use code tags when you post your script
iii) this is a shell script

Here is your script corrected.

Code:

#!/bin/sh
echo " Enter the String"
read str
echo $str > str.txt
len=`echo "$str" | wc -c`
len=`expr $len - 1`
s=0 ; i=1;
echo "Length of string = $len"
w=`echo "$str" | wc -w`
c=`echo "$str" | wc -c`
while [ $i -le $len ]
do
   str=`cut -c $i str.txt`
     if [ -z $str ]; then
       s=`expr $s + 1`
     fi
   i=`expr $i + 1`
done
echo "Character = $(( c - 1 ))"
echo "Words = $w"
echo "Spaces = $s"