$var -ne ${var} why?

Shell Programming and Scripting
1

hi there,

i read man sh(1) and tried to understand the difference between $var and ${var}, but i'm still unsure. when do we use one and when do we use the other? i need an example :rolleyes:

thx

2

In a case like:
letter=A
title="${letter}system"

We want to create a variable called title which has the value "Asystem". But without the braces the shell will think we have a variable called "lettersystem".