I tried doing that with export and set env, but it did not work. how to do it?

for example

~/directory$ export a.home=1 
bash: export: `a.home=1': not a valid identifier
up vote 8 down vote accepted

The dot is not a valid character in a shell identifier.
So the answer is "you cannot do what you ask":

   name   A word consisting only of  alphanumeric  characters  and  under-
          scores,  and beginning with an alphabetic character or an under-
          score.  Also referred to as an identifier.
  • You can set var names with periods as per @Amos 's post below – Taras Mar 25 '14 at 6:26

Actually a colleague just asked me and I found a work-around - use

env var.with.dots=value command
  • As accurate as the previous answer is, this one is much more useful. – kboom Jan 10 '17 at 21:58

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