Better error messages for command not found (was Re: Pull in upstream before 9.1 code freeze?)

[Wojciech Puchar]

>>
>> are you serious that linux distros have such a think now?
>> I didn't use linux for a long time and no plan to use it, but you are joking isn't it?
>
> They do, and it's actually very useful in two cases:

no it isn't. unless it would be extra keypress for that.

i don't want to be treated as a moron just as when i use google search 
with javascript active.