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 echo "$( madeupname && echo ':' || echo '${fail:?die}' )" |\ . /dev/stdin sh: command not found: madeupname /dev/stdin:1: fail: die echo $? 126 

 echo "$(madeup && echo \: || echo '${fail:?die}')" |\ . /dev/stdin sh: command not found: madeup /dev/stdin:1: fail: die echo $? 126 

 var="$( madeupname )" ; echo "${var:?die} still not stderr" sh: command not found: madeupname sh: var: die echo $? 1 

 var="$(madeup)" ; echo "${var:?die} still not stderr" sh: command not found: madeup sh: var: die echo $? 1 

 trap 'printf %s\\n trap resurrects the shell!' v1="$( madeup )" v2="$( printf %s\\n this displays after trap)" echo "${v1:?first up - still stderr}" "${v2:?dont see this anyway}" sh: command not found: madeup sh: v1: first up - still stderr trap resurrects the shell! this displays after the trap echo $? 0 

 trap 'printf %s\\n trap resurrects shell!' ERR v1="$(madeup)" v2="$(printf %s\\n shown after trap)" echo "${v1:?#1 - still stderr}" "${v2:?invisible}" sh: command not found: madeup sh: v1: #1 - still stderr trap resurrects shell! shown after trap echo $? 0