unix - Substring command not working in solaris kshell -


i trying use following command extract substring string : 

propertypath=$(echo $path|awk '{print substr($0,3,$index)}')

however command not pick value of $index variable , therefore not return valid substring.

this work:

propertypath=$(echo $path|awk '{print substr($0,3,'$index')}')

or

propertypath=$(echo $path|awk -v index=$index '{print substr($0,3,index)}')

-

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