ls的输出结果： 加管道符，重定向后后面的命令的命令输出按行处理的.
如：
[gan@localhost ~]$ ls
Desktop Download gan Pictures Public Videos
Documents g Music prog Templates
[gan@localhost ~]$ ls > g
[gan@localhost ~]$ cat g
Desktop
Documents
Download
g
gan
Music
Pictures
prog
Public
Templates
Videos
[gan@localhost ~]$ echo "`ls`"
Desktop
Documents
Download
g
gan
Music
Pictures
prog
Public
Templates
Videos
[gan@localhost ~]$ ls | awk '{print $0}'
Desktop
Documents
Download
g
gan
Music
Pictures
prog
Public
Templates
Videos
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