How to get the status of the last command?

[oliwer]

Hi there.

When using the shell interactively, I like to be notified when a command fails. In rc this is easy to do: I just need to check if $status contains an element !~ 0. But how can I do the same with es? Obviously I cannot use <={...}.

[mwgamera]

It's not as obvious as it should be, but putting something along the lines of the following into ~/.esrc should save the result of each command as the global $status variable in login shells:

noexport = $noexport status
fn %eval-noprint { status = <=$* }
fn %eval-print { echo $* >[1=2]; status = <=$* }

I you want it in non-login interactive shell, then I'm afraid it might require modifying initial.es and recompiling. (cf. #33)

[oliwer]

Thanks! That's good enough for my need. It was indeed not easy to guess from the manpage.