Is it the same convention as those used in known programming languages such as Java and C? I'm trying to create a lot of variables and I want it to start with a number, but I'm not sure if it's okay.
variable naming convention in shell is
Variable name must begin with alphanumeric character or underscore character (_), followed by one or more alphanumeric or underscore characters. note that:
Variables can also contain digits, but a name starting with a digit is not allowed
see tldp for more details.