如何从期望脚本中捕获标准错误

the following expect script will remove the file /var/tmp/file on remote machine

以下expect脚本将删除远程计算机上的文件/ var / tmp / file

but before that the expect script do ssh on the remote machine ,

但在此之前,expect脚本在远程机器上执行ssh,

I put the 2>/tmp/errors in order to catch error from ssh

我把2> / tmp /错误放到了ssh中来捕获错误

but I notice that in spite ssh to remote send error , I not see the errors from /tmp/errors file

但我注意到,尽管ssh远程发送错误,我没有看到/ tmp / errors文件中的错误

but when I tryed manual the

但是当我尝试手动的时候

ssh   $LOGIN@$machine

then ssh fail on WARNING: REMOTE HOST IDENTIFICATION HAS CHANGED

然后ssh失败警告:远程主机识别已更改

but from the expect I cant to catch this errors in /tmp/erros

但是从预期我无法在/ tmp / erros中捕获这个错误

please advice what’s is wrong ? why 2>/tmp/errors not capture the errors?

请指出什么是错的?为什么2> / tmp / errors没有捕获错误?

 expect_test=`cat << EOF
 set timeout 50
 spawn  ssh   $LOGIN@$machine  2>/tmp/errors
       expect {
                 ")?"   { send "yes\r"  ; exp_continue  }

                 word:  { sleep 1 ; send $PASSORD\r}
              }
 expect >  {send "sleep 1\r"}
 expect >  {send "rm -f /var/tmp/file\r"}
 expect >    {send exit\r}
 expect eof
 EOF` 


 expect -c  "$expect_remove_file"

1 个解决方案

#1

spawn does not understand I/O redirection. Replace

spawn不了解I / O重定向。更换

spawn  ssh   $LOGIN@$machine  2>/tmp/errors

with either

spawn  ssh   $LOGIN@$machine -E /tmp/errors
# -E log_file tells ssh where to write the error log instead of stderr

or

spawn  sh -c "ssh $LOGIN@$machine 2>/tmp/errors"