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dot in variable name

From: Eric Peterson
Subject: dot in variable name
Date: Thu, 14 May 2020 09:03:57 -0700

I remember reading about variable names containing dots (i.e.  tax.amount).  
Some sort of namespace of variables. 

$ declare tax.amount=0
-bash: declare: `tax.amount=0': not a valid identifier

I can't find any link to it anymore.  I could be wrong. But is this allowed in 
some manner?  I like the idea of grouping logically related variables by 
namespace.  Not sure how or where I'll use it, but seems like an interesting 


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