On Thursday, July 5, 2018 at 8:22:08 AM UTC-5, Peter Percival wrote:
> I wrote a "Hello world" program in C.
>
> gcc hello.c
>
> creates a.out without warnings or error messages.  ls shows that a.out
> exists.
>
> a.out
>
> gets the response
>
> -bash: a.out: command not found

Try './a.out'.  It is likely that '.' is not in your path.

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