On Sat, Mar 14, 2015 at 8:46 AM, Linda Walsh <b...@tlinx.org> wrote: > > > 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)
Stdout and stderr are commonly used for other purposes. But using fd 3 and above seems to be a good walkaround. Does anybody have a cleaner solution? > 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 > > -- Regards, Peng
