How to define User defined variables (UDV)

To define UDV use following syntax
Syntax:
variable name=value

'value' is assigned to given 'variable name' and Value must be on right side = sign.

Example:
$ no=10# this is ok
$ 10=no# Error, NOT Ok, Value must be on right side of = sign.
To define variable called 'vech' having value Bus
$ vech=Bus
To define variable called n having value 10
$ n=10