已通过ssh嵌套引用运行shell命令

问题描述

我有这个下面的shell命令：

I have this following shell command:

ssh user@host "df | grep /dev/ | \
awk 'BEGIN{print "DISK", "%USAGE", "STATUS"} {split($5, a, "%"); \
var="GREEN"; print $1, $5, var}' | column -t"

我需要通过ssh运行，但我因嵌套双和单引号的presence得到语法错误。

I need to run this over ssh but I get syntax error due to the presence of nested double and single quotes.

我试开始前和报价结束转义字符，但它并没有解决问题。

I tried the escape characters for before the beginning and ending of the quotes but it did not solve the problem.

但是，在运行这会给下面的输出本地系统：

However, on local system running this will give the following output:

$ df | grep /dev/ | \
awk 'BEGIN{print "DISK", "%USAGE", "STATUS"} {split($5, a, "%"); \
var="GREEN"; print $1, $5, var}' | column -t
DISK       %USAGE  STATUS
/dev/sda1  95%     GREEN

感谢

推荐答案

一个引号定界符允许省略外报价：

A quoted heredoc allows you to omit the outer quotes:

ssh user@host <<'END'
df | grep /dev/ | awk 'BEGIN{print "DISK", "%USAGE", "STATUS"} {split($5, a, "%"); var="GREEN"; print $1, $5, var}' | column -t
END

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