T) What is the difference between $ and ${} substitution. ?

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  •  ${} substitution is similar to $ substitution except that the parameter must be preceded by curly brackets.  If we talk about these in parameter definitions then - 

   1. If the interpretation is $ substitution then we can give the value as both $ substitution and ${} substitution. e.g. Parameter can be of name $AI_SERIAL or ${AI_SERIAL}

   2. If the interpretation is ${} substitution then we can only give the value as ${} substitution parameter. e.g. Parameter can only be of name ${AI_SERIAL} 

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