Re: How to deal with errors in <()?

[Linda Walsh]

Peng Yu wrote:
> Hi,
>
> http://mywiki.wooledge.org/ProcessSubstitution
>
> The above webpage says the following.
>
> commandA <(commandB; [commandB's exit code is available here from $?])
> [commandB's exit code cannot be obtained from here.  $? holds
> commandA's exit code]

> Does anybody have a good solution for this situation? Thanks.
--
It's not a pretty solution, but how about some variation of:

> alias cmda='cat >/dev/tty'        ## 1st cmd
> alias cmdb='(echo "foo";exit 2)'  ## command executes, but exits w/err=2
> read status < <(cmda <(cmdb; echo "status=$?" >&2) 2>&1)
status=2
foo
---
not ideal, but it does get you the status.
Instead of echoing it you could assigned it to a var,
and test the value and only print status if non-zero,
something like:

  ((status=$?)) && echo "status=$status

instead of just the echo