When I expand shell variable which have tab chars or space chars, how it works.

Environment

• bash

Problems

When I defined shell values such below, how is space chars or tab chars in variable processed?

packages=' httpd postgresql redis ' yum install ${packages} 

How to solve

It is expanded to yum httpd postgresql redis, and it works as expected.

Description

Let's see how it is expanded with using echo command.

#!/bin/bash # your code goes here packages=' httpd postgresql redis ' echo ${packages} echo '${packages}' echo "${packages}" 

output

httpd postgresql redis ${packages} httpd postgresql redis 

https://ideone.com/XfbkBI

When I quote variable with double quote, it expand, but tab characters or space characters does not replaced with single space.