[root@luolei ~]# cd /tmp
[root@luoleit tmp]# cd director/
[root@luolei director]# cat file1.txt file2.txt file3.txt>filetest.txt
[root@luolei director]# ls
[root@luolei ~]# cd /tmp
[root@luoleit tmp]# cd director/
[root@luolei director]# cat file1.txt file2.txt file3.txt>filetest.txt
[root@luolei director]# ls
2128

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