在循环结束时您已经在等待eof，您只需要使用wait和catch结果:

You're already waiting for the eof at the end of your loop, you just need to use wait and catch the result:

spawn true
expect eof
catch wait result
exit [lindex $result 3]

退出为0.

spawn false
expect eof
catch wait result
exit [lindex $result 3]

以1退出.