bash脚本属性文件中使用“。”在变量名 [英] Bash Script Properties File Using '.' in Variable Name

问题描述

我是新来的bash脚本和有一个关于使用从性能的.properties问题bash脚本内提交。

I'm new to bash scripting and have a question about using properties from a .properties file within a bash script.

我已经看到了使用一个bash属性文件'。变量名之间，例如：

I have seen a bash properties file that uses'.' between variable names, for example:

this.prop.one=someProperty

和我见过他们就像一个脚本中调用：

and I've seen them called from within a script like:

echo ${this.prop.one}

但是，当我尝试设置这个属性我得到一个错误：

But when I try to set this property I get an error:

./test.sh: line 5: ${this.prop.one}: bad substitution

如果我这样做，我没有可以使用的属性'。在变量名称，包括道具文件：

I can use properties if I do it without '.' in the variable names, and include the props file:

#!/bin/bash
. test.properties
echo ${this_prop_one}

我真的希望能够使用'。在变量名，并且，如果可能的话，不一定要包括的。 test.properties脚本的

这可能吗？

更新：

谢谢您的回答！好吧，那么这很奇怪。

Thanks for your answers! Well, then this is strange. I'm working with a bash script that looks like this (a service for glassfish):

#!/bin/bash

start() {
        sudo ${glassfish.home.dir}/bin/asadmin start-domain domain1
}

...

...而且有属性文件这样的（build.properties）：

...and there are property files like this (build.properties):

# glassfish
glassfish.version=2.1
glassfish.home.dir=${app.install.dir}/${glassfish.target}
...

因此​​，必须有这样做的权利的某种方式？这些也许不是视为变量的定义，如果他们在属性文件中在声明？再次感谢。

So, there must be some way of doing this right? Are these maybe not considered 'variables' by definition if they're declared in a properties file? Thanks again.

推荐答案

加载它们变成一个关联数组。这需要你的shell是bash的4.x的，而不是 / bin / sh的（其中，甚至当一个符号链接来砸在POSIX兼容模式运行）。

Load them into an associative array. This will require your shell to be bash 4.x, not /bin/sh (which, even when a symlink to bash, runs in POSIX compatibility mode).

declare -A props
while read -r; do
  [[ $REPLY = *=* ]] || continue
  props[${REPLY%%=*}]=${REPLY#*=}
done <input-file.properties

...之后就可以像这样访问他们：

...after which you can access them like so:

echo "${props[this.prop.name]}"

这篇关于bash脚本属性文件中使用“。”在变量名的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！