MySQL version at prompt might be useful

[sergio-m]

SUGGESTION ONLY:

Perhaps appending the MySQL version to the prompt might be useful for debugging sessions when testing features against different versions.

This seems to be coded in the sandbox.sh
MYSQL_PS1="mysql[sandbox]> " \

Suggestions:

mysql-5.0.95 [sandbox] >
mysql-5.5.42 [sandbox] >
mariadb-10.0.17 [sandbox] >

[abg]

This can be overridden in the my.sandbox.cnf:

[mysql]
no-auto-rehash
prompt = "mysql-\v [sandbox]> "

And then you'll see something like:

# ./sandbox.sh mysql
...
mysql-5.6.23-log[sandbox]> 

I think it's reasonable to remove the use of MYSQL_PS1 and push this into my.sandbox.cnf instead so it's more obviously configurable in the future.