在脚本中通过SSH使用反引号(`) [英] Using backticks (`) over ssh in a script

问题描述

我有一个命令，当我在本地运行时，我使用反引号获取其中包含的命令的输出，我想通过ssh发送此命令(这不是实际命令，而是一个简化的示例)

I have a command that, when I run locally, I use backticks in to get that output of the commands contained within them and I want to send this over ssh (this isn't the actual command but a shortened example)

cat `ls -alr | grep 'someregex'`

我尝试使用

ssh -f hostname cat `ls | grep 'someregex'`

但是这不符合我的预期，而是在本地执行反引号，有人知道如何解决吗?

however this doesn't act as I was expecting and instead executes the backticks locally, does anyone know a way around this?

推荐答案

尝试将命令用引号引起来:

Try enclosing the command in quotes:

ssh -f hostname 'cat `ls | grep "someregex"`'

请注意，内部引号必须替换为双引号.

Note that the inner quotes have to be replaced with double quotes.

此外，请注意，您不能将整个命令用双引号引起来，因为bash会在调用ssh之前在本地扩展子shell.例如，比较以下命令:

Also, note that you can't enclose the whole command in double quotes, because bash will expand the subshell locally before it invokes ssh. For example, compare the following commands:

$ echo "`echo foo`"
foo
$ echo '`echo foo`'
`echo foo`

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