On Thu, May 14, 2015 at 1:27 AM, Kevin Ushey <kevinus...@gmail.com> wrote:
[...]
> So maybe `cat` just doesn't set a status code, and so there's nothing
> for R to forward back (ergo -- NULL)?
>
cat definitely sets the status. IMHO every command sets the exit status, by
definition, at least on Unix/Linux.
/tmp$ touch x
/tmp$ cat x
/tmp$ echo $?
0
/tmp$ cat y
cat: y: No such file or directory
/tmp$ echo $?
1
Gabor
[...]
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