[RFA] candidates for ambiguous command in upper case

[Jerome Guitton]

Yao Qi (qiyaoltc@gmail.com):

> IMO, there is nothing wrong.  There is no command starts from "EX".

This is a bit weird to accept upper-case EXEC-FIL then... isn't it?

(gdb) exec-fil
No executable file now.
(gdb) EXEC-FIL
No executable file now.