Linux shell脚本中字符串连接的方法

$value1=home
$value2=${value1}"="
echo $value2

[root@localhost sh]# var1=/etc/
[root@localhost sh]# var2=yum.repos.d/
[root@localhost sh]# var3=${var1}${var2}
[root@localhost sh]# echo $var3
/etc/yum.repos.d/