cosh-osc$ printf '%s%s\n' '__RDY_' 'A__'
__RDY_A__
printf '%s%s' '__CORE_PAYLOAD_' 'BEGIN__'; {
cosh-osc$ printf '%s%s' '__CORE_PAYLOAD_' 'BEGIN__'; {
>  set -e; false && printf bad; printf errexit-context
> }; rc=$?; printf '%s%s:%s\n' '__CORE_PAYLOAD_' 'END__' "$rc"; printf '%s%s\n' '__CORE_' 'DONE__'
__CORE_PAYLOAD_BEGIN__errexit-context__CORE_PAYLOAD_END__:0
__CORE_DONE__
cosh-osc$ exit
exit