有关set -e和子shell的问题

fiag

echo "ada" && (set -e; echo "yes"; cat nothing; echo "no")
echo "ret: $?"

echo "ada" && (set -e; echo "yes"; cat nothing; echo "no") && echo "123123"
echo "ret: $?"

子shell的执行结果不一致，第一例不会打印 no， 第二例会打印no，
返回值也不同。

这是为什么呢？

lastart

-e      Exit immediately if a pipeline (which may  consist  of  a  single
                      simple  command),  a subshell command enclosed in parentheses, or
                      one of the commands executed as part of a command  list  enclosed
                      by braces (see SHELL GRAMMAR above) exits with a non-zero status.
                      [color="Red"]The shell does not exit if the command that fails is part of  the
                      command list immediately following a while or until keyword, part
                      of the test following the if or elif reserved words, part of  any
                      command  executed in a && or ⎪⎪ list except the command following
                      the final && or ⎪⎪, any command in a pipeline but the last, or if
                      the  command's  return value is being inverted with !.  A trap on
                      ERR, if set, is executed before the  shell  exits.   This  option
                      applies  to  the  shell environment and each subshell environment
                      separately (see COMMAND EXECUTION  ENVIRONMENT  above),  and  may
                      cause  subshells to exit before executing all the commands in the
                      subshell.

fiag

Thank you very much.