Shell 脚本 — 将字符串与变量连接后的奇怪行为 [英] Shell script — weird behaviour after concatenating string with variables

问题描述

我正在从我的 shell 脚本中读取一个 .properties 文件.我想读取某个键的一些值，然后想将它附加到某个字符串之间，但输出很奇怪.

I am reading a .properties file from my shell script. I wanted to read some value for some key and after that want to append it in between some string but the output is weird.

#!/bin/bash
# Script used to read Property File
FILE_NAME="Test.properties"
prop_value=$(cat ${FILE_NAME} | grep Address)
echo "ABC${prop_value}DEF"

我的Test.properties是这样的

my Test.properties is like this

Name=Pravin
Age=25
Address=Mumbai
asd=asd

执行此脚本后，我期待

ABCAddress=MumbaiDEF 

但我得到的输出像

DEFAddress=Mumbai 

这里会出现什么问题?

如果我在脚本中定义任何变量它都可以工作，但是当我使用命令扩展从文件中读取它时它不起作用.

If I define any variable in a script it works, but when I read it from file using command expansion it doesn't work.

推荐答案

要在扩展时从变量中修剪回车，您可以使用 ${varname%$'\r'}.因此:

To trim carriage returns from a variable on expansion, you can use ${varname%$'\r'}. Thus:

echo "ABC${prop_value%$'\r'}DEF"

最好将您的属性文件保存为原生 Unix 文本文件，其中根本不包含回车符.

Better would be to save your properties file as a native Unix text file, which contains no carriage returns at all.

这篇关于Shell 脚本 — 将字符串与变量连接后的奇怪行为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！