当在bash stdout或stderr重定向，其实我重定向到一个文件 [英] When redirecting in bash to stdout or stderr, I actually get redirected to a file

问题描述

我节省通过ssh远程上执行一个命令的输出，但我也执行一些回声。为了看清屏幕上的信息，而不是将它们保存到我想他们重定向变量。
我曾尝试>＆功放; 1>和2，但在每种情况下一个文件名为无论是1创建或2
这是扩大引号或转义字符的问题？

I'm saving the output of one command executed on a remote via ssh, but I also execute some echos. In order to see the messages on the screen and not save them to the variable I want to redirect them. I have tried >&1 and >&2 but in each case a file is created with the name either "1" or "2" Is this an issue of expanding quotes or escaping characters?

OUTPUT=$(sshpass -p password ssh user@ip 'echo "Message1" >&2 ;
                                          su -lc "./rootscript.sh" >&2; 
                                          echo "$?" ')
echo "su output is: $OUTPUT"

输出：

在屏幕上没有任何一个文件名为2文本密码内（假设消息1被覆盖）程序仍在等待输入密码，即使没有提示，所以当我输入输出还是不错的：

Nothing on screen, a file named "2" with the text "Password" inside (assuming Message 1 was overwritten) The program still waits for a password, even without a prompt, so when I enter it the output is good:

su output is: 0

我怎样才能让我的消息，在屏幕上显示？

How can I get my messages to show on screen?

推荐答案

@JonathanLeffler抓住了问题的时候了 - 你没有使用bash，但是tcsh的。

@JonathanLeffler caught the problem right away -- you're not using bash, but tcsh.

tcsh中有它自己的语法使用bash是不相容的。

tcsh has its own syntax incompatible with bash.

这并不不过没关系：因为 SSH 和 sshpass 返回远程命令的退出code，这是你应该做的是：

It doesn't matter though: since ssh and sshpass return the remote command's exit code, this is how you should be doing it:

if sshpass -p password ssh user@ip 'echo "Message1"; su -lc "./rootscript.sh"'
then
  echo "The command succeeded (exit code $?)"
else
  echo "The command failed (exit code $?)"
fi

如果你真的想在远程shell中运行bash中的东西，你可以做使用达菲查尔斯的code对于小的修改：

If you really wanted to run something in bash on the remote shell, you could do use Charles Duffy's code with a minor change:

                                      #    v-- shell specified here
output=$(sshpass -p password ssh user@ip bash << 'EOF'
   echo "Message1" >&2
   su -lc "./rootscript.sh" >&2 
   echo "$?"
EOF
)

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