Re: Document variable names need to be all ASCII

[Greg Wooledge]

On Mon, Apr 19, 2021 at 08:28:54PM +0800, 積丹尼 Dan Jacobson wrote:
> $ e哈=1
> bash: e哈=1: command not found
> OK, but on man bash is it ever mentioned that a variable name must be all 
> ASCII?
> 
> ENVIRONMENT
>        When a program is invoked it is given an array of  strings  called  the
>        environment.   This  is  a  list  of  name-value  pairs,  of  the  form
>        name=value....
> 
> PARAMETERS
>        A parameter is an entity that stores values.  It can be a name, a  num‐
>        ber, or one of the special characters listed below under Special Param‐
>        eters.  A variable is a parameter denoted by a name.  A variable has 
> ...

DEFINITIONS

       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.

"Alphanumeric" here clearly means [[:alnum:]] within the POSIX locale.