[CentOS] Getting the return value of the last command run

Mon May 30 22:14:43 UTC 2011
fred smith <fredex at fcshome.stoneham.ma.us>

On Mon, May 30, 2011 at 05:38:56PM +0300, Dotan Cohen wrote:
> All commands return a value, usually 0 if run properly. For instance, try:
> $ ls && echo "done"
> $ lsd && echo "done"
> The echo command is only executed if the ls command exited
> successfully. If one did not add the echo command with the && after a
> command, how can he determine if the command exited successfully? I
> have a particularly troubling script that gives does not mention if it
> exits successfully or not. I could modify it (and probably will some
> day) but in general I'd like to know the answer to this question as a
> learning experience.

Yes, all commands return a value UNLESS it was written by one of the
idi,... er, misguided programmers who thinks its ok to write (in 

void main (void)

because, of course, in C main() always returns SOMETHING.

I'm sure it's the same in a bash script, even if the script doesn't
explicitly provide a return value I imagine the shell returns something
anyway, it's just that it's meaningless when that happens.

---- Fred Smith -- fredex at fcshome.stoneham.ma.us -----------------------------
                       I can do all things through Christ 
                              who strengthens me.
------------------------------ Philippians 4:13 -------------------------------