linux shell `符号详解

<pre>
[root@iZ23uewresmZ arjianghu]# echo `ls`
asss.html common guaji.php images index.php log.log register.html register.php restartswoole.sh testditu.html timg.jpg zhuangtai.php
[root@iZ23uewresmZ arjianghu]# echo $(ls)
asss.html common guaji.php images index.php log.log register.html register.php restartswoole.sh testditu.html timg.jpg zhuangtai.php
[root@iZ23uewresmZ arjianghu]#
</pre>
就是变量。。